Isospin excitations of a trapped 1D gas of attractively interacting fermions

Details Isospin excitations of a trapped 1D gas of attractively interacting fermions Isospin excitations of a trapped 1D gas of attractively interacting fermions

2007-12-25

arxiv.org/abs/0712.4081v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure; minor corrections

Scientific paper

We consider a gas of fermions with a short-range attractive intercomponent interaction in a parabolic external potential and derive the conditions of the local density approximation. The obtained spectrum of quasiparticle (isospin) excitations shows equidistant low-energy levels, which is equivalent to a linear momentum dependence and is fundamentally different from the ordinary Dirac spectrum in the spatially uniform case.

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