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| W. Kohn | |
|---|---|
| Name | Walter Kohn |
| Birth date | 9 March 1923 |
| Birth place | Vienna, Austria |
| Death date | 19 April 2016 |
| Death place | Santa Barbara, California, United States |
| Nationality | Austrian-born Canadian-American |
| Alma mater | University of Toronto; Harvard University |
| Notable works | Density Functional Theory |
| Awards | Nobel Prize in Chemistry (1998) |
W. Kohn Walter Kohn was an Austrian-born physicist and theoretical chemist whose work established the foundations of modern electronic structure theory. He developed density functional theory that transformed research in quantum mechanics, solid state physics, materials science, and theoretical chemistry, earning broad recognition across institutions such as University of California, Santa Barbara, Harvard University, and University of Toronto.
Kohn was born in Vienna during the interwar period and experienced the rise of Nazism that led to his internment and subsequent emigration via the Kindertransport and wartime transfers to Canada. He pursued higher education at the University of Toronto where he studied under mentors connected to Arthur Eddington's intellectual lineage, later receiving a doctorate at Harvard University supervised by figures linked to John Van Vleck and the postwar American theoretical physics community. During his formative years he interacted with scholars from Princeton University, Massachusetts Institute of Technology, and the wartime research networks that included personnel from Los Alamos National Laboratory.
Kohn held appointments across North American institutions, including faculty positions at University of California, San Diego, University of California, Santa Barbara, University of Chicago, and visiting roles at Bell Labs and Imperial College London. His collaborations connected him with researchers at Bell Telephone Laboratories, Argonne National Laboratory, and the Max Planck Society, influencing work in condensed matter physics and shaping graduate training in departments at Stanford University and Yale University. He supervised students who later joined faculties at Columbia University, Princeton University, and Caltech, and he participated in conferences organized by American Physical Society, Royal Society, and Deutsche Physikalische Gesellschaft.
Kohn formulated key results on the electronic properties of matter, including proofs and theorems that clarified charge screening in metals and localization in disordered systems, interfacing with ideas from Lev Landau, Philip Anderson, and Enrico Fermi. His most influential contribution, density functional theory, recast the many-electron problem by using electron density rather than many-body wavefunctions, integrating concepts from Paul Dirac, Wolfgang Pauli, and John Slater. He produced formal results now foundational alongside methods from Hartree–Fock theory, Green's functions, and pseudopotential approaches used in studies at Brookhaven National Laboratory and Oak Ridge National Laboratory. Kohn's theorems influenced computational implementations used in packages developed at Argonne National Laboratory and research at IBM Research and SRI International, enabling advances in studies of semiconductors such as silicon and superconductors connected to work by John Bardeen.
In 1998 Kohn shared the Nobel Prize in Chemistry with John Pople for his development of density-functional theory and computational methods, recognized by institutions including the Royal Swedish Academy of Sciences and attended by representatives from National Academy of Sciences, American Academy of Arts and Sciences, and the Royal Society of London. He received honors such as fellowships and medals from American Physical Society, Materials Research Society, and national orders from Canada and the United States National Medal of Science community. His award citation cited the impact of his work on electronic structure calculations used in studies at Los Alamos National Laboratory and in industrial research at General Electric and Siemens.
Kohn authored seminal papers and monographs published in journals and outlets tied to Physical Review, Reviews of Modern Physics, and proceedings of meetings at Solvay Conference venues. Notable papers explore density functional formulations, variational principles, and applications to solids, often cited alongside works by Pierre Hohenberg, Lu Jeu Sham, and contemporaries publishing in Journal of Chemical Physics. His publications influenced textbooks used at University of Cambridge, ETH Zurich, and University of Tokyo.
Kohn's personal trajectory linked Central European origins in Vienna with North American academic life in Santa Barbara and communities around San Diego; he mentored generations who joined faculties at University of California, Berkeley, University of Illinois Urbana-Champaign, and University of Michigan. His legacy endures through methods implemented in electronic-structure codes used at Lawrence Berkeley National Laboratory and educational curricula at Massachusetts Institute of Technology, and his archives and oral histories are preserved in collections at institutions such as Harvard University and the American Institute of Physics. Category:Physicists