Density instabilities in a two-dimensional dipolar Fermi gas

Details Density instabilities in a two-dimensional dipolar Fermi gas Density instabilities in a two-dimensional dipolar Fermi gas

2011-09-12

arxiv.org/abs/1109.2464v2

Phys. Rev. Lett. 108, 145304 (2012)

Physics

Condensed Matter

Quantum Gases

5 pages, 3 figures. Published version

Scientific paper

10.1103/PhysRevLett.108.145304

We study the density instabilities of a two-dimensional gas of dipolar fermions with aligned dipole moments. We show that the Random Phase Approximation (RPA) for the density-density response function is never accurate for the dipolar gas. We incorporate correlations beyond RPA via an improved version of the Singwi-Tosi-Land-Sjolander scheme. In addition to density-wave instabilities, our formalism captures the collapse instability that is expected from Hartree-Fock calculations but is absent from RPA. Crucially, we find that when the dipoles are perpendicular to the layer, the system spontaneously breaks rotational symmetry and forms a stripe phase, in defiance of conventional wisdom.

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