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Author Bertaina, G. ♦ Stringari, S. ♦ Pitaevskii, L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CONFINEMENT ♦ DAMPING ♦ DENSITY ♦ EXCITATION ♦ FERMI GAS ♦ GASES ♦ HYDRODYNAMICS ♦ POTENTIALS ♦ QUANTUM FLUIDS ♦ RESPONSE FUNCTIONS ♦ SECOND SOUND ♦ SOUND WAVES ♦ SUPERFLUIDITY ♦ THERMAL CONDUCTIVITY ♦ TRAPPING ♦ UNITARITY ♦ VELOCITY ♦ VISCOSITY ♦ WAVE PROPAGATION ♦ ENERGY-LEVEL TRANSITIONS ♦ FLUID MECHANICS ♦ FLUIDS ♦ FUNCTIONS ♦ MECHANICS ♦ PHYSICAL PROPERTIES ♦ THERMODYNAMIC PROPERTIES
Abstract We investigate the propagation of density and temperature waves in a cylindrically trapped gas with radial harmonic confinement. Starting from two-fluid hydrodynamic theory we derive effective 1D equations for the chemical potential and the temperature which explicitly account for the effects of viscosity and thermal conductivity. Differently from quantum fluids confined by rigid walls, the harmonic confinement allows for the propagation of both first and second sound in the long wavelength limit. We provide quantitative predictions for the two sound velocities of a superfluid Fermi gas at unitarity. For shorter wavelengths we discover a new surprising class of excitations continuously spread over a finite interval of frequencies. This results in a nondissipative damping in the response function which is analytically calculated in the limiting case of a classical ideal gas.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-10-08
Publisher Place United States
Journal Physical Review Letters
Volume Number 105
Issue Number 15


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