Collective Motion of Polarized Dipolar Fermi Gases in the Hydrodynamic Regime

Recently, a seminal STIRAP experiment allowed the creation of 40K-87Rb molecules in the rovibrational ground state [K.-K. Ni et al., Science 322, 231 (2008)]. In order to describe such a polarized dipolar Fermi gas in the hydrodynamic regime, we work out a variational time-dependent Hartree-Fock app...

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Bibliographic Details
Published in:arXiv.org 2010-03
Main Authors: Lima, Aristeu R P, Pelster, Axel
Format: Article
Language:English
Subjects:
Anisotropy
Dipole interactions
Fermi gases
Momentum
Particle density (concentration)
Time dependence
Online Access:Get full text
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Summary:Recently, a seminal STIRAP experiment allowed the creation of 40K-87Rb molecules in the rovibrational ground state [K.-K. Ni et al., Science 322, 231 (2008)]. In order to describe such a polarized dipolar Fermi gas in the hydrodynamic regime, we work out a variational time-dependent Hartree-Fock approach. With this we calculate dynamical properties of such a system as, for instance, the frequencies of the low-lying excitations and the time-of-flight expansion. We find that the dipole-dipole interaction induces anisotropic breathing oscillations in momentum space. In addition, after release from the trap, the momentum distribution becomes asymptotically isotropic, while the particle density becomes anisotropic.
ISSN:2331-8422
DOI:10.48550/arxiv.0908.4583