Dynamical properties of dipolar Fermi gases

Details Dynamical properties of dipolar Fermi gases Dynamical properties of dipolar Fermi gases

2008-12-04

arxiv.org/abs/0812.0948v1

New J. Phys. 11, 055017 (2009)

Physics

Condensed Matter

Other Condensed Matter

14 pages, 8 figures, submitted to New J. Phys

Scientific paper

10.1088/1367-2630/11/5/055017

We investigate dynamical properties of a one-component Fermi gas with dipole-dipole interaction between particles. Using a variational function based on the Thomas-Fermi density distribution in phase space representation, the total energy is described by a function of deformation parameters in both real and momentum space. Various thermodynamic quantities of a uniform dipolar Fermi gas are derived, and then instability of this system is discussed. For a trapped dipolar Fermi gas, the collective oscillation frequencies are derived with the energy-weighted sum rule method. The frequencies for the monopole and quadrupole modes are calculated, and softening against collapse is shown as the dipolar strength approaches the critical value. Finally, we investigate the effects of the dipolar interaction on the expansion dynamics of the Fermi gas and show how the dipolar effects manifest in an expanded cloud.

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