Zero Sound in Dipolar Fermi Gases

Details Zero Sound in Dipolar Fermi Gases Zero Sound in Dipolar Fermi Gases

2009-06-22

arxiv.org/abs/0906.3753v2

Physics

Condensed Matter

Quantum Gases

Significant changes due to newly found instability

Scientific paper

We study the propagation of sound in a homogeneous dipolar gas at zero
temperature, known as zero sound. We find that undamped sound propagation is
possible only in a range of solid angles around the direction of polarization
of the dipoles. Above a critical dipole moment, we find an unstable mode, by
which the gas collapses locally perpendicular to the dipoles' direction.

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