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

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

2008-12-18

arxiv.org/abs/0812.3643v2

Phys. Rev. Lett. 102, 085302 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures, published version, updated figures and a number of changes

Scientific paper

10.1103/PhysRevLett.102.085302

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 non-spherical momentum distribution, and could be excited by a quick time variation of the scattering length.

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