Large Amplitude Dynamics of the Pairing Correlations in a Unitary Fermi Gas

Aurel Bulgac and Sukjin Yoon
Phys. Rev. Lett. 102, 085302 – Published 25 February 2009

Abstract

A unitary Fermi gas has a surprisingly rich spectrum of large amplitude modes of the pairing field alone, which defies a description within a formalism involving only a reduced set of degrees of freedom, such as quantum hydrodynamics or a Landau-Ginzburg-like description. These modes are very slow, with oscillation frequencies well below the pairing gap, which makes their damping through quasiparticle excitations quite ineffective. In atomic traps these modes couple naturally with the density oscillations, and the corresponding oscillations of the atomic cloud are an example of a new type of collective mode in superfluid Fermi systems. They have lower frequencies than the compressional collective hydrodynamic oscillations, have a nonspherical momentum distribution, and could be excited by a quick time variation of the scattering length.

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  • Received 18 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.085302

©2009 American Physical Society

Authors & Affiliations

Aurel Bulgac and Sukjin Yoon

  • Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA

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Issue

Vol. 102, Iss. 8 — 27 February 2009

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