Sound velocity and multibranch bogoliubov spectrum of an elongated fermi superfluid in the BEC-BCS crossover
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概要
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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.
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