Ph.D. Duke University, 1960
Work in this laboratory is in condensed matter physics, fundamental quantum physics and in gravity measurements. In condensed matter physics we have been measuring the properties of very pure, near perfect crystals of solid 4He. Our work has shown that vacancies in the lattice behave as a Bose gas. We are attempting to determine if that gas can condense into a type of superfluid.
Electrons can quantum tunnel from the surface of liquid helium where they are trapped in a shallow potential well. We are currently investigating the tunneling rates in the presence of microwave radiation in a search for evidence of quantum dissipation, classical chaos, and finite tunneling times.
Gravity as a function of time is most accurately measured over long periods of time using the superconducting gravimeter invented and developed in this laboratory. We have used it for fundamental gravity studies and for geophysics. Currently we are using it to study properties of the deep interior of the earth and tectonic processes associated with earthquakes.
Selected Publications:
Search for Evidence of the Influence of Vacancies on the Thermal Conductivity of Solid 4He. With C.A. Burns. J. Low Temp. Phys., 93, (1993).
Single Electron Tunneling from the Surface of Liquid Helium. With G.F. Saville, and P.M. Platzman. Phys. Rev. Lett., March 8, (1993).
Test of the Gravitational Inverse Square Law at 0.4 to 1.4 m Mass Separation. J. Goodkind, et al. Phys. Rev. D, 47, 1290 (1993).
Test of theoretical solid earth and ocean gravity tides, Geophys.J.Int 125, 106-114 (1996).