Hydrodynamic excitations of trapped dipolar fermions

Details Hydrodynamic excitations of trapped dipolar fermions Hydrodynamic excitations of trapped dipolar fermions

2002-08-30

arxiv.org/abs/cond-mat/0208598v2

Phys. Rev. A 67, 025601 (2003)

Physics

Condensed Matter

4 pages, 2 eps figures, final version

Scientific paper

10.1103/PhysRevA.67.025601

A single-component Fermi gas of polarized dipolar particles in a harmonic trap can undergo a mechanical collapse due to the attractive part of the dipole-dipole interaction. This phenomenon can be conveniently manipulated by the shape of the external trapping potential. We investigate the signatures of the instability by studying the spectrum of low-lying collective excitations of the system in the hydrodynamic regime. To this end, we employ a time-dependent variational method as well as exact numerical solutions of the hydrodynamic equations of the system.

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