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Lev Landau

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Lev Davidovich Landau was a monumental figure in twentieth-century physics.

Rundyna5
Rundyna5

He was a Soviet theoretical physicist who possessed a rare, universal understanding of the field. Many historians consider him one of the last scientists to be well-versed in every branch of physics. His work provided the fundamental foundations for condensed matter physics, which examines how large groups of atoms behave.

2008. Марка России stamp hi12735121754be840efc8511
2008. Марка России stamp hi12735121754be840efc8511

Through mathematical models, he explained how matter transitions between different states and how particles interact.

Landau's scientific contributions covered a vast range of complex phenomena. He co-discovered the density matrix method in quantum mechanics alongside John von Neumann. He developed the quantum mechanical theory of diamagnetism and the theory of Fermi liquids. He also explained Landau damping in plasma physics and identified the Landau pole in quantum electrodynamics. One of his most famous achievements was the Ginzburg–Landau theory of superconductivity. This theory helps explain how certain materials can conduct electricity without any resistance. He also worked on the two-component theory of neutrinos and the theory of second-order phase transitions.

One of his most significant breakthroughs involved the study of superfluidity. Superfluidity is a state where a liquid flows with zero viscosity, meaning it has no internal friction. Landau developed a mathematical theory to explain the properties of liquid helium II. This specific state occurs when the liquid is cooled to a temperature below 2.17 K, which is approximately -270.98 °C. For this remarkable achievement, he was awarded the 1962 Nobel Prize in Physics.

UA035-10
UA035-10

His work showed how sound waves, known as phonons, and a new type of excitation called a roton could explain this behavior.

Landau's journey began in Baku, in what is now Azerbaijan, on 22 January 1908.

Landau1910
Landau1910

His father was an engineer in the oil industry, and his mother was a doctor. He was a mathematical prodigy who mastered differential calculus at age 12. He graduated from gymnasium at only 13 years old. In 1922, at age 14, he began studying physics, mathematics, and chemistry at Baku State University. He later moved to Leningrad to study at the Physics Department of Leningrad State University, eventually earning his doctorate in 1934.

During his career, Landau traveled through Europe to collaborate with the greatest minds of his time. He worked at the Niels Bohr Institute in Copenhagen, an experience that deeply influenced his approach to physics. He also visited Cambridge to work with Paul Dirac and Zürich to work with Wolfgang Pauli. Between 1932 and 1937, he led the Department of Theoretical Physics at the Ukrainian Physics and Technology Institute in Kharkov. There, he founded the "Landau school," a famous tradition of theoretical physics. He and Evgeny Lifshitz also began writing the *Course of Theoretical Physics*, a ten-volume series still used by graduate students today.

Landau was known for his extremely high standards for scientific training. He created a comprehensive exam called the "Theoretical Minimum." This exam covered all aspects of theoretical physics to test a student's mastery. It was incredibly difficult; between 1934 and 1961, only 43 candidates successfully passed it. Those who did pass often became notable theoretical physicists themselves. His influence extended to the Soviet atomic program, where he led a team of mathematicians. He calculated the dynamics of the first Soviet thermonuclear bomb and predicted its yield, earning him the Stalin Prize in 1949 and 1953.

His life was marked by both political struggle and personal tragedy. In 1938, he was arrested by the NKVD for possessing a leaflet critical of the government.

1938-LandauL
1938-LandauL

He was released in 1939 only after Pyotr Kapitsa and Niels Bohr wrote letters to Joseph Stalin. In 1962, a severe car accident left him in a coma for two months. Although he survived, the injuries destroyed his scientific creativity. This prevented him from accepting his Nobel Prize in person. Landau died on 1 April 1968, at the age of 60.

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