Sir Anthony J. LEGGETT | Tokyo College
Honorary Director

Sir Anthony J. LEGGETT

Research interests Theoretical condensed matter physics Website
01 Description of Research

(1) Foundations of quantum mechanics, in particular motivating and designing experiments to test whether the predictions of the quantum formalism continue to be valid as one pushes them further and further in the direction of the everyday world.
(2)Topological quantum computing (TQC),especially in so-called "p+ip" superconductors. I am particularly interested in the question of whether the standard theoretical approach, based on the “spontaneous breaking of U(1) symmetry,” continues to be valid for the very delicate states which will be essential for the realization of TQC
(3)Thermal and transport properties of amorphous materials ("glasses"),in particular below ~1 K where they show an astounding degree of _quantitative_ universality.
(4)Properties of superfluid helium-3,particularly when thrown far out of equilibrium.

02 Short Biography

Born in London, in 1938
Balliol College, Oxford Literae Humaniores (classical languages and literature, philosophy and Greco-Roman history)
undergraduate degree in Physics, Merton College, Oxford.
1964 D.Phil.(Ph.D.) in theoretical physics
1964-1967 postdoctoral research in Urbana, Kyoto and elsewhere
1967 University of Sussex (UK)
1971 University of Sussex (UK) Reader
1978 University of Sussex (UK) Professor
1973-2013 Visiting professor at: Cornell University, Harvard University, University of Minnesota, Universidad Autonoma de Madrid, ENS Paris, Oxford University, Penn State University, Queens University, University of Florida, National University of Singapore, University of Waterloo, Shanghai Jiaotong University
1983-Present John D. and Catherine T. Macarthur Professor at the University of Illinois at Urbana-Champaign
2005-present Editorial Board, Proceedings of the National Academy of Science.

【Memberships of learned societies】
Royal Society (1980)
American Philosophical Society (1991)
American Academy of Arts and Sciences (1996)
Foreign Associate of the National Academy of Sciences (1997)*
Foreign Member, Russian Academy of Sciences (1999)
Fellow of the Institute of Physics
Fellow of the American Physical Society
Honorary Fellow of the Institute of Physics (UK) (1999)
*now regular member following receipt of US citizenship in Aug.2001
(dual with UK).

03 Major Publications

“The Problems of Physics”, OPUS series, Oxford University Press,1987 (reissued 2006)
“Quantum Liquids: Bose Condensation and Cooper Pairing in Condensed Matter Systems,” Oxford University Press, Oxford, 2006

“Theory of a Superfluid Fermi Liquid. I. General Formalism and Static Properties”. Phys. Rev. 140A, 1869 (1965).
“Spin Diffusion and Spin Echoes in Liquid 3He at Low Temperatures”, J. Phys. C3, 448 (1970).
“Can a Solid be ‘Superfluid’?”, Phys. Rev. Lett. 25, 1543 (1970).
“Spin Dynamics of an Anisotropic Fermi Superfluid (3He)”, Ann. Phys. (NY) 85, 11 (1974).
“A Theoretical Description of the New Phases of Liquid 3He”, Revs. Mod.Phys. 47, 331 (1975).
“Macroscopic Quantum Systems and the Quantum Theory of Measurement”, Prog. Theor. Phys. (Kyoto), Supplement No. 69, 80 (1980).
“Quantuum Tunnelling in a Dissipative System” (with A. O. Caldeira). Ann. Phys. (NY) 149, 374 (1983). Erratum, ibid. 153, 445 (1984).
“Nucleation of 3He-B from the A Phase: A Cosmic-Ray Effect?”, Phys. Rev. Lett. 53, 1096 (1984).
“Quantum Mechanics Versus Macro-Realism: Is the Flux there =0B when Nobody Looks?” (with A. Garg). Phys. Rev. Lett. 54, 857 (1985).
“Dynamics of the Dissipative Two-State System” (with S. Chakravarty, A. T. Dorsey, M. P. A. Fisher, A. Garg and W. Zwerger). Revs. Mod. Phys. 59, 1 (1987).
“Exact Upper Limit on Barrier Penetration Probabilities in Many-body Systems: Application to ‘Cold Fusion’” (with G. Baym), Phys. Rev. Lett. 63,191 (1989).
“Experimental Determination of the Superconducting Pairing State in YBCO from the Phase Coherence of YBCO-Pb SQUIDS” (with D. A. Wollman, D.J.Van Harlingen, W. C. Lee and D. M. Ginsberg), Phys. Rev. Lett. 71, 2134 (1993)
“Experimental Constraints on the Pairing State of the Cuprate Super-conductors: an Emerging Consensus” (with J.F. Annett and N.D. Goldenfeld), in D.M. Ginsberg, ed. Physical Properties of high Temperature Suprerconductors, vol.V, World Scientific, Singapore 1995.
“A `Mid-Infrared' Scenario for Cuprate Superconductivity”, Proc. Nat. Acad. Sciences 96,8365-8372 (1999).
“Bose Einstein Condensation in the Alkali Gases: some Fundamental Concepts”, Revs.Mod.Phys.73,307-356 (2001).
“High energy low temperature physics: production of phase transitions and topological defects by energetic particles in superfluid 3-He”, J. Low Temp. Phys.126,775 (2002)
“Universal sound absorption in amorphous solids: a theory of elastically coupled generic blocks” (with D.C. Vural), J. Noncrystalline Solids 357,3528 (2011)
“A strict experimental test of macroscopic realism in a superconducting flux qubit” (with G. C. Knee et al.), Nature Communications 7, 13253 (2016)
“Temperature-dependent ellipsometry measurements of partial Coulomb energy in superconducting cuprates” (with J. Levallois et al.), Physical Review X 6,031027 (2016)

04 Honors and Awards

Maxwell Medal and Prize (Institute of Physics, UK), 1975
Fritz London Memorial Award, 1981
Simon Memorial Prize 1981
Paul Dirac Medal and Prize (Institute of Physics, UK), 1992
John Bardeen Prize (with G.M. Eliashberg) (M^2S), 1994
Eugene Feenberg Memorial Medal, 1999
Wolf Prize in Physics (with B.I. Halperin), 2003
Nobel Prize in Physics (with A.A. Abrikosov and V.L. Ginzburg), 2003