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David Thouless

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David James Thouless was a highly influential British condensed-matter physicist. Condensed-matter physics is the study of how large groups of atoms and electrons behave together. His work helped scientists understand how matter organizes itself into complex patterns. This field is essential for understanding the physical properties of the world around us. Thouless made major theoretical discoveries regarding how matter changes states. These discoveries changed how we think about the structure of atoms and particles.

One of his most significant contributions involved the study of topological phases of matter. In physics, topology is a way of looking at shapes and how they are connected. Thouless helped discover topological phase transitions, which are shifts in how matter is ordered. He also explored topological ordering, a specific way that particles organize themselves. This research explained how systems of atoms and electrons work in large, extended systems. He also studied how electrons behave in disordered lattices, which are grids that are not perfectly neat.

Thouless applied his mathematical skills to many different areas of physics. He worked on many-body problems, which involve calculating how many particles interact at once. He studied superconductivity, a phenomenon where certain materials conduct electricity without any resistance. He also looked at the properties of nuclear matter and how nucleons behave. Within atomic nuclei, he studied excited collective motions, which are movements shared by many parts of the nucleus. He specifically helped clarify the concept of rearrangement energy. He also derived a mathematical expression for the moment of inertia in deformed nuclei.

His journey into science began in Bearsden, Scotland, on September 21, 1934. He was born to English parents, Priscilla and Robert Thouless. Priscilla was an English teacher, and Robert was a psychologist and broadcaster. Thouless attended St Faith's School and Winchester College for his early education. He then moved to the University of Cambridge to study Natural Sciences at Trinity Hall. Later, he earned his PhD from Cornell University in the United States. At Cornell, he studied under his doctoral advisor, Hans Bethe.

Throughout his career, Thouless held many important academic positions. He worked as a postdoctoral researcher at the Lawrence Berkeley Laboratory in California. Between 1958 and 1959, he taught a course on atomic physics at the University of California, Berkeley. In 1961, he became the first director of studies in physics at Churchill College, Cambridge. He served as a professor of mathematical physics at the University of Birmingham from 1965 to 1978. After a short time as a professor at Yale University, he joined the University of Washington in Seattle in 1980.

Because of his brilliant mind, Thouless received many of the highest honors in science. In 1979, he was elected a Fellow of the Royal Society. He also became a Fellow of the American Physical Society in 1986. In 1995, he was named a member of the US National Academy of Sciences. He won the Wolf Prize for Physics in 1990. He also received the Paul Dirac Medal in 1993 and the Lars Onsager Prize in 2000.

His most famous achievement came in 2016 when he won the Nobel Prize in Physics. He shared this prestigious award with J. Michael Kosterlitz and F. Duncan M. Haldane. They were recognized for their theoretical discoveries regarding topological phase transitions. This prize solidified his legacy as a leader in the field of physics. Thouless passed away on April 6, 2019, in Cambridge at the age of 84. To honor his memory, his family donated his Nobel Prize medal to Trinity Hall, Cambridge.

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