2002/08/31 by K. Goral, M. Brewczyk, K. Rzazewski
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physreva.67.025601
published as Phys. Rev. A 67, 025601 (2003) · 4 pages, 2 eps figures, final version
arxiv created 2003/02/06 · arxiv updated 2009/11/30
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.