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John Reppy

John L. Wetherill Professor of Physics Emeritus

John Reppy

Educational Background

B.A., 1954, University of Connecticut. M.S., 1956, University of Connecticut. Ph.D., 1961, Yale University. Assistant Professor, Physics, Yale University, 1962-66; Associate Professor, Physics, Cornell University, 1966-69; Full Professor, Physics, Cornell Unviersity, 1969-87; John L. Wetherill Professor of Physics, Cornell University, 1987-2005. John L. Wetherill Professor of Physics Emeritus, 2005-present; Visiting scientist, ATT Bell Laboratories, 1983; Visiting Appointments at: MIT; University of Manchester; University of Sussex. Fellow, American Academy of Arts and Sciences; Fellow, American Association for Advancement of Science; Fellow, American Physical Society; Fellow, Institute of Physics; Member, National Academy of Sciences; Fellow, New York Academy of Sciences; Sigma Xi. NSF Postdoctoral Fellow, 1961-62; Guggenheim Fellow, 1972-73, 1979-80; Fulbright-Hays Special Fellow, 1978; U.K. Science Research Council Senior Research Fellow, 1979-80, 1989-90; Fellow, Japan Society for Promotion of Science, 2000; Fritz London Memorial Award, 1981; NASA Distinguished Public Service Medal, 2000.


Low temperature phyiscs; bose condensation; critical phenomena; superfluidity in 4He, 3He and supersolids; low dimensional systems; space science


  • Physics

Graduate Fields

  • Physics


  • Laboratory of Atomic and Solid State Physics (LASSP)


The main interest of our group is directed toward an understanding of the macroscopic quantum properties of superfluid 3He, 4He, and the super solid state of solid 4He. The problems of Bose-Einstein condensation, inhomogeneous superfluid boundary conditions and the study of phase transitions in systems of reduced dimensionality are current research topics of my group. Persistent current studies, torsional oscillator measurements, nano kelvin thermometry, and propagation of 3rd and 4th sound are examples of the various experimental techniques used in this work. The group has a close association with those of Professors Lee and Parpia.

Our group will consider a new graduate student.