1901-1920
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1901 · Wilhelm Conrad Röntgen (Wilhelm Conrad Röntgen)
Germany
Citation
Awarded the first-ever Nobel Prize in Physics for his discovery of the remarkable rays that came to bear his name — X-rays.
Impact on the World
X-rays made it possible to see inside bones and organs without opening the body, launching the medical imaging technologies (X-ray, CT) still used today.
Biography
A German physicist who, while experimenting with vacuum tubes, stumbled on an unknown form of radiation and named it "X-rays" himself.
Other Research Fields
He chose not to patent his discovery, releasing X-ray technology as a gift to humanity, and donated his entire prize money to his university.
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1902 · Hendrik Lorentz (Hendrik Antoon Lorentz)
Netherlands
Citation
Recognized jointly for research into the influence of magnetism on radiation phenomena — the theoretical explanation of the Zeeman effect.
Impact on the World
The Lorentz transformation equations he established later became the mathematical foundation of Einstein's special theory of relativity.
Biography
A Dutch theoretical physicist who built an electron theory explaining electromagnetic phenomena in terms of the motion of atomic-scale charged particles.
Other Research Fields
Also widely known for the Lorentz contraction, the theory that a fast-moving object's length shortens along its direction of motion.
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1902 · Pieter Zeeman (Pieter Zeeman)
Netherlands
Citation
Awarded jointly for discovering that spectral lines split into several components under a strong magnetic field — the Zeeman effect.
Impact on the World
The Zeeman effect later became a standard tool for remotely measuring the magnetic-field strength of celestial bodies, and is still widely used in solar and stellar research.
Biography
A Dutch experimental physicist who confirmed his mentor Lorentz's theory experimentally, and shared the Nobel Prize with him.
Other Research Fields
He continued refining spectroscopic experiments throughout his later career.
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1903 · Henri Becquerel (Antoine Henri Becquerel)
France
Citation
Awarded half the prize for discovering natural radioactivity.
Impact on the World
His discovery of radioactivity became the starting point for all of nuclear physics, and his name lives on in the international unit of radioactivity, the becquerel (Bq).
Biography
A French physicist who stumbled on the fact that uranium compounds emit radiation on their own, even without exposure to light.
Other Research Fields
Coming from three generations of physicists, he also carried out research on phosphorescence and fluorescence.
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1903 · Pierre Curie (Pierre Curie)
France
Citation
Awarded the other half jointly with his wife Marie Curie for their joint research into the radiation phenomena Becquerel had discovered.
Impact on the World
Their isolation of the radioactive elements radium and polonium laid the foundation for radiation therapy (cancer treatment) and the use of radioactive isotopes.
Biography
A French physicist first known for his work on piezoelectricity before he began researching radioactivity together with his wife Marie Curie.
Other Research Fields
He discovered the piezoelectric effect, contributing to the development of precision measuring instruments.
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1903 · Marie Curie (Marie Curie)
France (born in Poland)
Citation
Awarded the other half jointly with her husband Pierre Curie for their joint research into the radiation phenomena Becquerel had discovered.
Impact on the World
The first woman to win a Nobel Prize, her discovery of radioactive elements was decisive for understanding atomic structure and for the development of radiation therapy for cancer.
Biography
A Polish-born physicist and chemist who worked in France and personally isolated the radioactive elements polonium and radium.
Other Research Fields
She won a second Nobel Prize, in Chemistry, in 1911 for the discovery of radium and polonium — becoming the first person ever to win Nobel Prizes in two different fields.
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1904 · Lord Rayleigh (John William Strutt) (Lord Rayleigh (John William Strutt))
United Kingdom
Citation
Awarded for his precise studies of the densities of major gases and, in the course of that work, his discovery of the new element argon.
Impact on the World
The discovery of argon first revealed that the periodic table contained an entirely new family of elements — the noble gases (Group 0).
Biography
A British physicist also famous for his theoretical explanation of the scattering of light (Rayleigh scattering — the reason the sky appears blue).
Other Research Fields
He left a broad body of work in acoustics and fluid dynamics as well, making him a prolific contributor across nearly every field of physics.
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1905 · Philipp Lenard (Philipp Eduard Anton von Lenard)
Germany
Citation
Awarded for his work on cathode rays (electron beams).
Impact on the World
His cathode-ray apparatus and data provided the experimental groundwork Einstein drew on in formulating the theory of the photoelectric effect.
Biography
A German physicist who discovered that cathode rays could pass through thin metal foil.
Other Research Fields
He later collaborated with the Nazi regime and denounced Einstein's theory of relativity as "Jewish physics," leaving a deeply controversial political legacy.
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1906 · J. J. Thomson (Joseph John Thomson)
United Kingdom
Citation
Awarded for his theoretical and experimental investigations into the conduction of electricity through gases.
Impact on the World
His discovery of the electron was the first proof that the atom was not the indivisible smallest unit of matter, becoming the starting point for all of modern atomic physics and electronics.
Biography
A physicist at Cambridge's Cavendish Laboratory who showed that cathode rays were in fact a stream of negatively charged particles — electrons.
Other Research Fields
His Cavendish Laboratory went on to produce numerous Nobel laureates, including Rutherford.
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1907 · Albert Michelson (Albert Abraham Michelson)
United States
Citation
The first American to win the prize, honored for developing precision optical instruments and for the spectroscopic and metrological research carried out with them.
Impact on the World
The Michelson–Morley experiment, performed with his interferometer, showed that no medium ("ether") for transmitting light exists — a decisive clue leading to Einstein's special theory of relativity.
Biography
An American physicist who invented an interferometer capable of measuring the speed of light with extraordinary precision.
Other Research Fields
He continued refining measurements of the speed of light throughout his career, contributing to the advancement of metrology.
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1908 · Gabriel Lippmann (Gabriel Lippmann)
France
Citation
Awarded for inventing a method of reproducing color photographs based on the interference of light.
Impact on the World
Although Lippmann's interference method never became commercially viable, the idea of recording information using the wave nature of light became a theoretical root of later holography technology.
Biography
A French physicist who developed a photographic process that reproduced natural color, using interference fringes of light captured on a photographic plate, without any dyes.
Other Research Fields
He also invented the capillary electrometer, contributing to the development of early electrocardiogram (heart electrical signal) measurement technology.
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1909 · Guglielmo Marconi (Guglielmo Marconi)
Italy
Citation
Awarded jointly in recognition of contributions to the development of wireless telegraphy.
Impact on the World
His practical wireless telegraphy achieved the first transatlantic wireless transmission, laying the commercial foundation for the entire radio and wireless communications industry.
Biography
An Italian inventor and entrepreneur who turned Hertz's theory of electromagnetic waves into a practical long-distance wireless communication technology.
Other Research Fields
His invention drew huge public attention after wireless communication played a decisive role in the rescue efforts during the sinking of the Titanic.
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1909 · Karl Ferdinand Braun (Karl Ferdinand Braun)
Germany
Citation
Awarded jointly in recognition of contributions to the development of wireless telegraphy.
Impact on the World
The cathode-ray tube (Braun tube) he invented remained a core component of televisions and computer monitors well into the late 20th century.
Biography
A German physicist who improved the tuning circuit of wireless telegraph transmitters, greatly increasing communication range and clarity.
Other Research Fields
He invented the cathode-ray tube (Braun tube), laying the foundation for display technology.
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1910 · Johannes Diderik van der Waals (Johannes Diderik van der Waals)
Netherlands
Citation
Awarded for his work on the equation of state for gases and liquids.
Impact on the World
His equation of state was the first to quantify the weak intermolecular attraction now called "van der Waals forces," a foundational concept still used across chemistry and materials science to describe intermolecular interactions.
Biography
A Dutch physicist who explained why real gases deviate from the ideal gas law by accounting for the volume of molecules and the attraction between them.
Other Research Fields
His research later provided a theoretical foundation for the liquefaction and low-temperature research of gases (such as Kamerlingh Onnes's liquefaction of helium).
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1911 · Wilhelm Wien (Wilhelm Wien)
Germany
Citation
Awarded for his discoveries regarding the laws governing heat radiation.
Impact on the World
His discovery, Wien's displacement law, provided a way to determine an object's temperature purely from its color, becoming a fundamental tool astronomers still use to measure the surface temperature of stars.
Biography
A German physicist who discovered that the wavelength distribution of light emitted by a hot object shifts according to its temperature.
Other Research Fields
His research on blackbody radiation provided the crucial experimental backdrop that led Planck to originate quantum theory.
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1912 · Nils Gustaf Dalén (Nils Gustaf Dalén)
Sweden
Citation
Awarded for his invention of automatic regulators for use with gas accumulators to light lighthouses and buoys.
Impact on the World
His automatic flashing apparatus allowed lighthouses and buoys to operate unattended, contributing substantially to maritime safety.
Biography
A Swedish inventor and engineer who continued his research and won the Nobel Prize even after being blinded in an explosion.
Other Research Fields
He developed technology (AGA) for safely storing acetylene gas, which found wide industrial use.
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1913 · Heike Kamerlingh Onnes (Heike Kamerlingh Onnes)
Netherlands
Citation
Awarded for his investigations into the properties of matter at low temperatures, which led, among other things, to the production of liquid helium.
Impact on the World
The extreme low-temperature environment he achieved, close to absolute zero, led to the discovery of superconductivity, and is the starting point for today's cryogenic technologies including MRI machines and ultra-fast computers.
Biography
A Dutch physicist who liquefied helium, setting the record for the lowest temperature achieved by humanity at the time.
Other Research Fields
During experiments with liquid helium, he became the first person to discover superconductivity — the complete disappearance of electrical resistance in mercury below a certain temperature.
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1914 · Max von Laue (Max von Laue)
Germany
Citation
Awarded for his discovery of the diffraction of X-rays by crystals.
Impact on the World
X-ray diffraction opened a way to directly observe the atomic arrangement inside matter, becoming a core analytical technique in modern structural biology (including the determination of DNA's structure) and materials science.
Biography
A German physicist who theoretically predicted and then experimentally confirmed that atoms in a crystal diffract X-rays.
Other Research Fields
He is known for publicly defending Einstein even during the Nazi era, upholding his scholarly convictions.
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1915 · William Henry Bragg (William Henry Bragg)
United Kingdom
Citation
Awarded jointly with his son for contributions to the analysis of crystal structure using X-rays.
Impact on the World
The X-ray crystallography technique the father-and-son team developed together remains a standard tool for determining molecular structure in drug development and materials research to this day.
Biography
A British physicist who, together with his son Lawrence Bragg, pioneered the new field of X-ray crystallography.
Other Research Fields
This father-son pair remains the first case in Nobel history of a parent and child winning the prize together.
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1915 · William Lawrence Bragg (William Lawrence Bragg)
United Kingdom
Citation
Awarded jointly with his father for contributions to the analysis of crystal structure using X-rays.
Impact on the World
Bragg's law, the formula he established describing the conditions for X-ray diffraction, remains the basic formula used in crystal-structure analysis to this day.
Biography
A British physicist who won the prize at 25, still the youngest laureate in any Nobel science category.
Other Research Fields
As director of Cambridge's Cavendish Laboratory, he later supported Watson and Crick's research that determined the double-helix structure of DNA.
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1917 · Charles Glover Barkla (Charles Glover Barkla)
United Kingdom
Citation
Awarded for his discovery of the characteristic X-rays unique to each element.
Impact on the World
His discovery that each element emits its own characteristic X-rays later developed into X-ray fluorescence (XRF) analysis, now widely used in industry, archaeology, and environmental analysis.
Biography
A British physicist who experimentally showed that each element emits X-rays at its own characteristic wavelength.
Other Research Fields
He also carried out research on the scattering and polarization of X-rays.
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1918 · Max Planck (Max Planck)
Germany
Citation
Awarded in recognition of his contributions to physics through the discovery of energy quanta.
Impact on the World
His discovery that energy is not continuous but comes in minimal units (quanta) opened an entirely new framework of physics — quantum mechanics — on which all modern electronic technology, from semiconductors to lasers, ultimately rests.
Biography
A German physicist who, trying to solve the problem of blackbody radiation, proposed that energy is emitted in discrete, indivisible packets (quanta).
Other Research Fields
As president of the German Academy of Sciences during the Nazi era he tried to protect Jewish scientists, and Germany's leading research institution, the Max Planck Society, later took his name.
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1919 · Johannes Stark (Johannes Stark)
Germany
Citation
Awarded for his discovery of the Doppler effect in canal rays and the splitting of spectral lines in electric fields — the Stark effect.
Impact on the World
The Stark effect became a key tool of spectroscopy for precisely probing atomic energy levels, and is also used to estimate the strength of electric fields in stellar atmospheres.
Biography
A German physicist who contributed experimentally to the development of early quantum theory.
Other Research Fields
Like Lenard, he later actively collaborated with the Nazis and attacked Einstein's theories, drawing heavy criticism within the scientific community.
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1920 · Charles Édouard Guillaume (Charles Édouard Guillaume)
France
Citation
Awarded in recognition of the service he rendered to precision measurements by his discovery of anomalies in nickel-steel alloys.
Impact on the World
The alloy he discovered (Invar), which barely expands or contracts with temperature change, has been widely used in precision clocks, surveying instruments, and optical devices, contributing to precision manufacturing.
Biography
A Swiss-born physicist who worked at the International Bureau of Weights and Measures in Paris, precisely studying the thermal expansion of metals.
Other Research Fields
He was long responsible for managing precision measurement standards, including the international standard meter bar.
1921-1940
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1921 · Albert Einstein (Albert Einstein)
Germany
Citation
Awarded for his services to theoretical physics, and especially for his discovery of the law of the photoelectric effect (not relativity — the photoelectric effect was the official citation).
Impact on the World
The photoelectric-effect theory proved that light also behaves as particles (photons), a decisive contribution to the founding of quantum mechanics, and is the principle behind today's solar cells and digital camera sensors.
Biography
A German-born theoretical physicist whose special and general theories of relativity fundamentally transformed humanity's understanding of time, space, and gravity.
Other Research Fields
Separately from his Nobel citation, the achievements that made him most famous are the mass–energy equivalence formula E=mc² and the general theory of relativity (which describes gravity as the curvature of spacetime).
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1922 · Niels Bohr (Niels Bohr)
Denmark
Citation
Awarded for his investigation of the structure of atoms and of the radiation emanating from them.
Impact on the World
His atomic model, in which electrons can only occupy specific energy orbits, established the foundational concepts of quantum mechanics and became the starting point for all atomic and molecular physics and chemical bonding theory that followed.
Biography
A Danish physicist who founded an institute bearing his name in Copenhagen, where he trained many of the scholars who led 20th-century quantum mechanics, including Heisenberg.
Other Research Fields
Also famous for his long-running debate with Einstein over the interpretation of quantum mechanics — the "Bohr–Einstein debates."
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1923 · Robert Millikan (Robert Andrews Millikan)
United States
Citation
Awarded for his work on the elementary charge of electricity and on the photoelectric effect.
Impact on the World
His oil-drop experiment precisely measured the charge carried by a single electron, establishing a fundamental physical constant used throughout all of electrical and electronic engineering since.
Biography
An American physicist who devised the experiment of observing oil droplets suspended in an electric field to measure the charge of the electron.
Other Research Fields
He also made major contributions to experimentally verifying Einstein's photoelectric-effect theory.
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1924 · Manne Siegbahn (Karl Manne Georg Siegbahn)
Sweden
Citation
Awarded for his discoveries and research in the field of X-ray spectroscopy.
Impact on the World
The X-ray spectroscopy techniques he refined greatly increased the accuracy of elemental analysis, contributing to later advances in materials science and medical diagnostic equipment.
Biography
A Swedish physicist who repeatedly improved the experimental techniques for precisely measuring X-ray spectra.
Other Research Fields
His son Kai Siegbahn later also won the Nobel Prize in Physics, in 1981, for research in electron spectroscopy — making them a father-and-son pair of laureates.
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1925 · James Franck (James Franck)
Germany
Citation
Awarded jointly for their discovery of the laws governing the impact of an electron upon an atom — the Franck–Hertz experiment.
Impact on the World
This experiment was the first to experimentally prove that an atom's energy exists only in discrete steps, providing crucial support for Bohr's quantized atomic model.
Biography
A German Jewish physicist who emigrated to the United States after the Nazis took power and later took part in the Manhattan Project, though he opposed using the atomic bomb in actual combat.
Other Research Fields
He submitted the "Franck Report" to the U.S. government, arguing for a public demonstration of the bomb to induce Japan's surrender rather than dropping it on a city.
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1925 · Gustav Hertz (Gustav Hertz)
Germany
Citation
Awarded jointly for their discovery of the laws governing the impact of an electron upon an atom — the Franck–Hertz experiment.
Impact on the World
The Franck–Hertz experiment remains a classic demonstration used in university physics education today, directly confirming the existence of quantized energy levels.
Biography
A German physicist and nephew of Heinrich Hertz, who first discovered electromagnetic waves.
Other Research Fields
After World War II, he took part in isotope-separation research in the Soviet Union.
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1926 · Jean Baptiste Perrin (Jean Baptiste Perrin)
France
Citation
Awarded for his work on the discontinuous structure of matter, and especially for his discovery of sedimentation equilibrium.
Impact on the World
His experiments demonstrated, in a way that could be directly observed, that atoms and molecules truly exist, effectively ending the lingering skepticism toward atomic theory at the time.
Biography
A French physicist who precisely observed the Brownian motion of tiny particles suspended in liquid, experimentally confirming Einstein's theory.
Other Research Fields
He led the founding of France's National Center for Scientific Research (CNRS), leaving a lasting mark on French science administration.
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1927 · Arthur Compton (Arthur Holly Compton)
United States
Citation
Awarded half the prize for his discovery of the effect that bears his name — the Compton effect.
Impact on the World
The Compton effect — the lengthening of an X-ray's wavelength when it collides with an electron — was decisive proof that light has particle-like properties, underpinning the establishment of quantum mechanics.
Biography
An American physicist who was also a key figure leading the construction of plutonium-production reactors for the Manhattan Project.
Other Research Fields
He also made major contributions to the study of cosmic rays (high-energy particles arriving from space).
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1927 · C. T. R. Wilson (Charles Thomson Rees Wilson)
United Kingdom
Citation
Awarded the other half for his method of making the paths of electrically charged particles visible by condensation of vapor — the invention of the cloud chamber.
Impact on the World
The cloud chamber (Wilson chamber) he invented served as the core detection instrument for particle-physics experiments for decades afterward, contributing to the discovery of several new particles, including the positron and muon.
Biography
A Scottish physicist who came up with the idea for the cloud chamber while studying mist and cloud phenomena atop a mountain.
Other Research Fields
He also carried out research into atmospheric electrical phenomena, such as lightning.
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1928 · Owen Richardson (Owen Willans Richardson)
United Kingdom
Citation
Awarded for his work on the thermionic phenomenon, and especially for the discovery of the law that bears his name — Richardson's law.
Impact on the World
His research on thermionic emission — electrons being emitted from heated metal — provided the theoretical basis for the development of later electronic devices such as vacuum tubes and the magnetron used in microwave ovens.
Biography
A British physicist who quantitatively characterized the emission of electrons from the surface of hot metal.
Other Research Fields
He also took part in research on the photoelectric effect and the gyromagnetic effect.
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1929 · Louis de Broglie (Louis-Victor de Broglie)
France
Citation
Awarded for his discovery of the wave nature of electrons.
Impact on the World
His theory that matter, too, behaves like a wave led to the development of the electron microscope, which today provides the theoretical foundation for the technology used to observe cells, viruses, and nanomaterials.
Biography
A French physicist from an aristocratic family who startled the academic world by proposing the wave nature of electrons in his doctoral thesis.
Other Research Fields
His theory directly inspired Schrödinger to develop wave mechanics.
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1930 · C. V. Raman (Chandrasekhara Venkata Raman)
India
Citation
Recognized for his work on the scattering of light and for the discovery of the effect that bears his name — the Raman effect — becoming the first Asian to win a Nobel Prize in the sciences.
Impact on the World
The Raman effect developed into Raman spectroscopy, a technique for identifying a substance's molecular structure by shining light on it, now widely used everywhere from pharmaceutical analysis to semiconductor quality inspection and art authentication.
Biography
An Indian physicist said to have been inspired to discover the Raman effect after wondering, during a sea voyage across the Mediterranean, why the ocean appeared blue.
Other Research Fields
He also took interest in the acoustics of musical instruments such as the violin.
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1932 · Werner Heisenberg (Werner Heisenberg)
Germany
Citation
Awarded for the creation of quantum mechanics, whose application has, among other things, led to the discovery of the allotropic forms of hydrogen (the 1932 prize, announced and awarded in 1933).
Impact on the World
His uncertainty principle — that a particle's position and momentum cannot both be known precisely at once — fundamentally transformed humanity's understanding of the microscopic world and remains a central pillar of quantum mechanics.
Biography
A German theoretical physicist who first formulated quantum mechanics using matrices (matrix mechanics).
Other Research Fields
During World War II he led Germany's atomic bomb program, which never reached completion, and his role in that effort has been the subject of long-running debate ever since.
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1933 · Erwin Schrödinger (Erwin Schrödinger)
Austria
Citation
Awarded jointly for the discovery of new productive forms of atomic theory.
Impact on the World
The Schrödinger equation he formulated, describing the state of an electron and other particles via a wave function, is the core mathematical tool of quantum mechanics and underlies all of today's calculations in chemical bonding and semiconductor device design.
Biography
An Austrian theoretical physicist who developed de Broglie's concept of matter waves into a complete wave mechanics.
Other Research Fields
Widely known to the public for "Schrödinger's cat," a thought experiment he devised to satirize the probabilistic interpretation of quantum mechanics.
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1933 · Paul Dirac (Paul Adrien Maurice Dirac)
United Kingdom
Citation
Awarded jointly for the discovery of new productive forms of atomic theory.
Impact on the World
The Dirac equation he formulated theoretically predicted the existence of the positron, the electron's antiparticle, which was indeed later discovered — becoming the starting point for antimatter research.
Biography
A British theoretical physicist who combined special relativity with quantum mechanics to establish relativistic quantum mechanics.
Other Research Fields
Also famous for his extreme reticence — physicists have jokingly defined a unit, "one dirac," as one word per hour.
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1935 · James Chadwick (James Chadwick)
United Kingdom
Citation
Awarded for the discovery of the neutron.
Impact on the World
The discovery of the electrically neutral neutron not only completely clarified the structure of the atomic nucleus but became the decisive key to nuclear fission chain reactions, nuclear power generation, and the development of the atomic bomb.
Biography
A British physicist and student of Rutherford who experimentally demonstrated that the atomic nucleus contained, besides protons, a particle with no electric charge.
Other Research Fields
He led Britain's atomic bomb program during World War II and afterward directed the British delegation within the Manhattan Project.
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1936 · Victor Hess (Victor Franz Hess)
Austria
Citation
Awarded half the prize for his discovery of cosmic radiation.
Impact on the World
The cosmic rays he discovered by observing radiation intensity from high-altitude hot-air balloon flights later became a primary observational target for discovering new particles in particle physics, and are also the starting point for research into cosmic radiation exposure today.
Biography
An Austrian physicist who personally rode hot-air balloons to high altitude, measuring radiation intensity to prove the existence of radiation arriving from space.
Other Research Fields
He emigrated to the United States to escape the Nazis' racial laws and continued his cosmic-ray research there.
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1936 · Carl Anderson (Carl David Anderson)
United States
Citation
Awarded the other half for his discovery of the positron.
Impact on the World
The discovery of the positron, the electron's antiparticle, experimentally confirmed Dirac's theoretical prediction, and is used today in medical imaging technology such as PET (positron emission tomography) scans.
Biography
An American physicist who, while observing cosmic rays with a cloud chamber, discovered a particle with the same mass as the electron but a positive charge.
Other Research Fields
He also contributed to the discovery of another new subatomic particle, the muon.
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1937 · Clinton Davisson (Clinton Joseph Davisson)
United States
Citation
Awarded jointly for their experimental discovery of the diffraction of electrons by crystals.
Impact on the World
The experimental proof that electrons diffract confirmed de Broglie's matter-wave theory, and became the experimental basis for the development of the electron microscope.
Biography
A physicist at Bell Labs in the United States who discovered the wave nature of electrons by accident while firing electrons at a nickel crystal.
Other Research Fields
At Bell Labs he also carried out research on electronic devices, including vacuum tubes.
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1937 · George Paget Thomson (George Paget Thomson)
United Kingdom
Citation
Awarded jointly for their experimental discovery of the diffraction of electrons by crystals.
Impact on the World
This father-and-son research — the father having discovered the electron as a particle and the son proving its wave nature — stands as a symbolic case illustrating quantum mechanics' central idea of "wave–particle duality."
Biography
A British physicist and son of the 1906 laureate J. J. Thomson.
Other Research Fields
During World War II he also served as an advisor on Britain's atomic energy policy.
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1938 · Enrico Fermi (Enrico Fermi)
Italy
Citation
Awarded for his demonstration of the existence of new radioactive elements produced by neutron irradiation, and for his discovery of nuclear reactions brought about by slow neutrons.
Impact on the World
His research using neutrons laid the groundwork for understanding nuclear fission chain reactions, directly leading to the first nuclear reactor (Chicago Pile-1) and, from there, to nuclear power generation and the development of the atomic bomb.
Biography
An Italian physicist who, using his Nobel Prize trip to Sweden as a pretext, emigrated directly to the United States to escape the fascist regime's racial laws.
Other Research Fields
In the Manhattan Project, he personally designed and operated the world's first artificial nuclear reactor, and is regarded as the figure who opened the atomic age.
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1939 · Ernest Lawrence (Ernest Orlando Lawrence)
United States
Citation
Awarded for the invention and development of the cyclotron and for results obtained with it, especially with regard to artificial radioactive elements.
Impact on the World
The particle accelerator he invented, the cyclotron, became the prototype for today's particle physics experimental equipment — from cancer-treatment proton therapy machines to the Large Hadron Collider (LHC).
Biography
An American physicist who invented the cyclotron, which uses a circular magnetic field to accelerate charged particles in a spiral path.
Other Research Fields
He founded a large research laboratory in Berkeley, California (today's Lawrence Berkeley National Laboratory), creating the model for American big science.
1941-1960
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1943 · Otto Stern (Otto Stern)
United States
Citation
Awarded for his contribution to the development of the molecular-ray method and his discovery of the magnetic moment of the proton.
Impact on the World
His molecular-beam technique later became the standard method for developing atomic clocks and for precision measurement experiments in atomic and molecular physics.
Biography
A German-born Jewish physicist who emigrated to the United States after the Nazis took power.
Other Research Fields
Through the Stern–Gerlach experiment, he experimentally proved that particles such as electrons and protons possess a quantized magnetic property called spin.
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1944 · Isidor Isaac Rabi (Isidor Isaac Rabi)
United States
Citation
Awarded for his resonance method for recording the magnetic properties of atomic nuclei.
Impact on the World
The nuclear magnetic resonance (NMR) technique he developed later became the core principle behind chemical structure analysis and, today, the magnetic resonance imaging (MRI) machines widely used in hospitals.
Biography
A physicist born in Poland who worked in the United States, developing a technique to precisely measure the resonance phenomenon by which atomic nuclei respond only at specific frequencies in a magnetic field.
Other Research Fields
After the war he was active as an advisor to the U.S. Atomic Energy Commission, exerting significant influence on science policy.
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1945 · Wolfgang Pauli (Wolfgang Pauli)
Austria
Citation
Awarded for the discovery of the Exclusion Principle, also called the Pauli principle.
Impact on the World
The exclusion principle — that two electrons cannot occupy the same quantum state simultaneously — became the fundamental principle explaining why the elements each have distinct chemical properties, that is, the structure of the periodic table as a whole.
Biography
An Austrian theoretical physicist famous for his sharp critiques, nicknamed "the scourge of God" by his colleagues.
Other Research Fields
He theoretically predicted the existence of the neutrino to explain the apparently missing energy in beta decay.
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1946 · Percy Bridgman (Percy Williams Bridgman)
United States
Citation
Awarded for the invention of an apparatus to produce extremely high pressures, and for the discoveries he made therewith in the field of high-pressure physics.
Impact on the World
His high-pressure experimental techniques later contributed to geophysical research recreating the material states of Earth's mantle and core in the laboratory, as well as to the development of artificial diamond synthesis.
Biography
An American physicist who devoted his career at Harvard University to studying matter under extremely high pressure.
Other Research Fields
He also left a mark in the philosophy of science by advocating "operationalism" — the view that concepts should be defined by the methods used to measure them.
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1947 · Edward Appleton (Edward Victor Appleton)
United Kingdom
Citation
Awarded for his investigations of the physics of the upper atmosphere, especially for the discovery of the ionospheric layer known as the Appleton layer.
Impact on the World
His discovery that the ionosphere reflects radio waves made long-distance radio broadcasting and shortwave wireless communication possible, and also provided a crucial theoretical foundation for radar technology during World War II.
Biography
A British physicist who experimentally demonstrated the existence of an ionized layer in the upper atmosphere that reflects radio waves.
Other Research Fields
Building on his ionospheric research, he was also involved in Britain's early radar development program.
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1948 · Patrick Blackett (Patrick Maynard Stuart Blackett)
United Kingdom
Citation
Awarded for his development of the Wilson cloud chamber method, and his discoveries therewith in the fields of nuclear physics and cosmic radiation.
Impact on the World
His improved automatic-photography cloud chamber technique was used in several particle discoveries, and his operational-research methodology was later widely applied to postwar industrial management and policy decisions.
Biography
A British physicist who, during World War II, pioneered operational research, the mathematical analysis of military operations.
Other Research Fields
After the war he was a leading voice in the anti-nuclear disarmament movement and provided science-policy advice to developing countries.
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1949 · Hideki Yukawa (Hideki Yukawa)
Japan
Citation
Awarded for his prediction of the existence of mesons on the basis of theoretical work on nuclear forces, becoming the first Japanese Nobel laureate.
Impact on the World
His prediction of a particle (the meson) that mediates the strong nuclear force binding protons and neutrons inside the atomic nucleus was later confirmed experimentally, and became an important foundation for the development of the Standard Model of particle physics.
Biography
A Japanese theoretical physicist who predicted, on theoretical grounds, the existence of a new particle mediating the strong binding force between protons and neutrons within the atomic nucleus.
Other Research Fields
After the war he also spoke out in postwar Japan against nuclear weapons and in favor of the peace movement.
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1950 · Cecil Powell (Cecil Frank Powell)
United Kingdom
Citation
Awarded for his development of the photographic method of studying nuclear processes and his discovery of the meson made with this method.
Impact on the World
Using the photographic-emulsion technique he developed, the pion (pi meson) predicted by Yukawa was actually discovered — a landmark case of theory and experiment matching up in the development of particle physics.
Biography
A British physicist who discovered new subatomic particles by exposing photographic emulsions to cosmic rays carried aloft on high-altitude balloons.
Other Research Fields
He also took part in founding the Pugwash Conferences, an international scientists' movement against nuclear weapons, after the war.
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1951 · John Cockcroft (John Douglas Cockcroft)
United Kingdom
Citation
Awarded jointly in recognition of their pioneering work on the transmutation of atomic nuclei by artificially accelerated atomic particles.
Impact on the World
Their experiment, the first artificial splitting of an atomic nucleus, became the starting point for all nuclear physics research based on particle accelerators.
Biography
A British physicist who led Britain's postwar nuclear power program.
Other Research Fields
He directed the construction of Britain's first nuclear reactor and the development of nuclear power stations.
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1951 · Ernest Walton (Ernest Thomas Sinton Walton)
Ireland
Citation
Awarded jointly in recognition of their pioneering work on the transmutation of atomic nuclei by artificially accelerated atomic particles.
Impact on the World
Splitting a lithium nucleus artificially with the Cockcroft–Walton accelerator is regarded as the first laboratory confirmation of Einstein's mass–energy equivalence (E=mc²).
Biography
An Irish physicist and the first Irish-born winner of a Nobel Prize in the sciences.
Other Research Fields
After his prize, he devoted many years to teaching at Trinity College Dublin.
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1952 · Felix Bloch (Felix Bloch)
United States
Citation
Awarded jointly for their development of new methods for nuclear magnetic precision measurements and discoveries in connection therewith.
Impact on the World
The nuclear magnetic resonance (NMR) measurement method he developed, along with Rabi's research, became the core technology behind today's hospital MRI scans and chemical structure analysis.
Biography
A Swiss-born physicist who worked in the United States, developing a new method for precisely measuring the magnetic properties of the atomic nucleus.
Other Research Fields
Also well known for "Bloch's theorem," which describes the motion of electrons in solids, laying a foundation for modern semiconductor theory.
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1952 · Edward Purcell (Edward Mills Purcell)
United States
Citation
Awarded jointly for their development of new methods for nuclear magnetic precision measurements and discoveries in connection therewith.
Impact on the World
His nuclear magnetic resonance research was also applied to radio astronomy, contributing to the discovery of the 21-centimeter hydrogen line used to observe hydrogen gas in space.
Biography
An American physicist who, independently of Bloch, discovered the phenomenon of nuclear magnetic resonance at Harvard University.
Other Research Fields
He pioneered the radio-astronomy technique for observing neutral hydrogen in galaxies, contributing to research into galactic structure.
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1953 · Frits Zernike (Frits Zernike)
Netherlands
Citation
Awarded for his demonstration of the phase-contrast method, especially for his invention of the phase-contrast microscope.
Impact on the World
The phase-contrast microscope he invented made it possible to clearly observe living, transparent cells without staining, and it remains essential equipment in biology and medical laboratories to this day.
Biography
A Dutch physicist who devised an optical technique that converts tiny phase differences in light into differences of brightness.
Other Research Fields
He was also involved in designing precision optical instruments for astronomy.
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1954 · Max Born (Max Born)
United Kingdom (born in Germany)
Citation
Awarded half the prize for his fundamental research in quantum mechanics, especially for his statistical interpretation of the wave function.
Impact on the World
His probabilistic interpretation of the wave function remains at the core of the interpretation of quantum mechanics (the Copenhagen interpretation) still standard today.
Biography
A German-born Jewish physicist who emigrated to the United Kingdom after the Nazis took power, and did his research at the University of Edinburgh.
Other Research Fields
Famous for the many students he trained, including Heisenberg and Oppenheimer.
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1954 · Walther Bothe (Walther Bothe)
West Germany
Citation
Awarded the other half for the coincidence method and his discoveries made therewith.
Impact on the World
The coincidence-counting method he developed — recognizing an event as valid only when two or more detectors register a signal simultaneously — is still used as a standard noise-elimination technique in particle-physics experiments today.
Biography
A German physicist who developed precise detection techniques while researching cosmic rays and nuclear reactions.
Other Research Fields
During World War II he took part in Germany's nuclear reactor development project.
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1955 · Willis Lamb (Willis Eugene Lamb)
United States
Citation
Awarded half the prize for his discoveries concerning the fine structure of the hydrogen spectrum.
Impact on the World
The tiny energy-level difference he discovered — the "Lamb shift" — could not be explained by the Dirac equation alone, prompting Feynman and others to refine quantum electrodynamics (QED).
Biography
An American physicist who conducted extraordinarily precise measurements of the energy levels of the hydrogen atom.
Other Research Fields
He also made early theoretical contributions to the development of laser theory.
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1955 · Polykarp Kusch (Polykarp Kusch)
United States
Citation
Awarded the other half for his precision determination of the magnetic moment of the electron.
Impact on the World
His precise measurement of the electron's magnetic moment, revealing a tiny deviation from theoretical prediction, prompted an even more refined verification of quantum electrodynamics.
Biography
A German-born physicist who worked in the United States, experimentally showing that the electron has a magnetic moment very slightly larger than theoretically predicted.
Other Research Fields
He carried out various precision-measurement experiments using molecular-beam techniques.
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1956 · William Shockley (William Bradford Shockley)
United States
Citation
Awarded jointly for their research on semiconductors and their discovery of the transistor effect.
Impact on the World
The invention of the transistor replaced the vacuum tube and became the core component of every modern electronic device from computers to smartphones, laying the physical foundation for the information technology revolution of the late 20th century.
Biography
A physicist at Bell Labs in the United States who led the team that developed the transistor, though he later became embroiled in major controversy over eugenics-related statements.
Other Research Fields
Before the name "Silicon Valley" existed, he founded a semiconductor company in California, laying the cornerstone for the formation of Silicon Valley.
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1956 · John Bardeen (John Bardeen)
United States
Citation
Awarded jointly for their research on semiconductors and their discovery of the transistor effect.
Impact on the World
The invention of the transistor became the foundation of every digital device today, and Bardeen became the only person ever to win the Nobel Prize in Physics twice for this achievement.
Biography
An American physicist skilled in both theory and experiment, who provided a key theoretical foundation for the development of the transistor.
Other Research Fields
In 1972 he won a second Nobel Prize in Physics for the BCS theory explaining superconductivity.
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1956 · Walter Brattain (Walter Houser Brattain)
United States
Citation
Awarded jointly for their research on semiconductors and their discovery of the transistor effect.
Impact on the World
The first working transistor he built experimentally miniaturized radios and computers, transforming the entire electronics industry.
Biography
An American experimental physicist who, building on Bardeen's theory, personally assembled the first working transistor.
Other Research Fields
He devoted his career to surface physics, the study of the physical properties of semiconductor surfaces.
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1957 · Chen Ning Yang (Chen Ning Yang)
Republic of China (Taiwan)
Citation
Awarded jointly for their penetrating investigation of the parity laws — a symmetry principle governing elementary particles — which led to important discoveries regarding elementary particles.
Impact on the World
Their prediction that "left–right symmetry" (parity conservation), until then taken for granted, could be violated in the weak interaction was subsequently confirmed by experiment, an achievement regarded as having overturned one of particle physics's most fundamental assumptions.
Biography
A China-born theoretical physicist who worked in the United States, presenting, together with Tsung-Dao Lee, a theory that upended existing assumptions in particle physics.
Other Research Fields
He also left major contributions foundational to the modern Standard Model of particle physics in statistical mechanics and gauge theory (the Yang–Mills theory).
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1957 · Tsung-Dao Lee (Tsung-Dao Lee)
Republic of China (Taiwan)
Citation
Awarded jointly for their penetrating investigation of the parity laws — a symmetry principle governing elementary particles — which led to important discoveries regarding elementary particles.
Impact on the World
When Chien-Shiung Wu experimentally confirmed the pair's theoretical prediction, it was first established that the weak nuclear force breaks nature's left-right symmetry.
Biography
A China-born theoretical physicist who worked in the United States, winning the Nobel Prize at just 31 — the youngest laureate at the time.
Other Research Fields
He continued research across a broad range of fields including statistical mechanics and astrophysics.
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1958 · Pavel Cherenkov (Pavel Alekseyevich Cherenkov)
Soviet Union
Citation
Awarded jointly for the discovery and the interpretation of the Cherenkov effect.
Impact on the World
The bluish glow (Cherenkov radiation) emitted when a charged particle moves through a medium faster than light does in that medium is used both to monitor conditions inside nuclear reactors and as the core observation principle of large neutrino detectors such as Japan's Kamiokande.
Biography
A Soviet physicist who first discovered the distinctive blue glow that appears in water near radioactive material.
Other Research Fields
He continued to study the interaction of high-energy particles with matter throughout his career.
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1958 · Ilya Frank (Il'ja Mikhailovich Frank)
Soviet Union
Citation
Awarded jointly for the discovery and the interpretation of the Cherenkov effect.
Impact on the World
The theoretical explanation of the Cherenkov effect that he completed together with Igor Tamm became the physical basis for the design of Cherenkov detectors used to detect cosmic rays and high-energy particles.
Biography
A Soviet physicist who, together with Igor Tamm, theoretically explained the phenomenon Cherenkov had discovered.
Other Research Fields
He also took part in research on reactor physics and neutron optics.
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1958 · Igor Tamm (Igor Yevgenyevich Tamm)
Soviet Union
Citation
Awarded jointly for the discovery and the interpretation of the Cherenkov effect.
Impact on the World
The theory of Cherenkov radiation is used today not only in the design of particle detectors, but his work also influenced the early proposal of the tokamak concept for confining fusion plasma with magnetic fields.
Biography
A Soviet theoretical physicist who, together with Andrei Sakharov, was among the first to propose the concept of a fusion reactor (the tokamak).
Other Research Fields
He laid early theoretical groundwork for fusion energy research.
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1959 · Emilio Segrè (Emilio Gino Segrè)
United States
Citation
Awarded jointly for the discovery of the antiproton.
Impact on the World
The discovery of the antiproton, the antiparticle of the proton, was an important milestone experimentally confirming the theory that every particle has a corresponding antiparticle.
Biography
An Italian-born Jewish physicist who emigrated to the United States to escape racial laws, and discovered the antiproton using Lawrence's cyclotron.
Other Research Fields
He also took part in research that first artificially produced technetium, an element not found in nature.
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1959 · Owen Chamberlain (Owen Chamberlain)
United States
Citation
Awarded jointly for the discovery of the antiproton.
Impact on the World
Following the discovery of the antiproton, antimatter research accelerated in earnest, an effort that continues today in PET scans used in hospitals and in research on the matter-antimatter asymmetry of the early universe.
Biography
An American physicist who, together with Segrè, designed a large accelerator experiment to detect the antiproton.
Other Research Fields
He later took interest in nuclear physics experiments and the anti-nuclear peace movement.
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1960 · Donald Glaser (Donald Arthur Glaser)
United States
Citation
Awarded for the invention of the bubble chamber.
Impact on the World
The bubble chamber he invented served as the standard particle-detection instrument in particle-physics experiments for over 20 years, decisively contributing to the discovery of numerous new subatomic particles.
Biography
An American physicist famous for the story that he was inspired by bubbles in a glass of beer to invent a device that lets the trajectory of a particle passing through superheated liquid be seen as a trail of bubbles.
Other Research Fields
After his Nobel Prize, he switched his research field entirely to molecular biology and co-founded a biotechnology startup.
1961-1980
1981-2000
2001-2025