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Ghosh, Tarun Kanti Okayama University
Machida, Kazushige Okayama University
We study properties of excited states of an elongated Fermi superfluid along the Bose-Einstein-condensate-BCS crossover including the unitarity limit. Analytic expressions for the sound velocity in an inhomogeneous as well as homogeneous Fermi superfluid along the crossover are obtained on the basis of the hydrodynamic theory. The complete excitation spectrum of axial quasiparticles with various discrete radial nodes is presented. We discuss the feasibility of measuring the sound velocity and the multibranch Bogoliubov spectrum experimentally.
Digital Object Identifer:10.1103/PhysRevA.73.013613
Published with permission from the copyright holder. This is the institute's copy, as published in Physical Review A, January 2006, Volume 73, Issue 1, Pages 6.
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Physical Review A
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