Parish, MM;
Marchetti, FM;
(2012)
Density instabilities in a two-dimensional dipolar fermi gas.
Physical Review Letters
, 108
(14)
, Article e145304. 10.1103/PhysRevLett.108.145304.
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Abstract
We study the density instabilities of a two-dimensional gas of dipolar fermions with aligned dipole moments. The random phase approximation (RPA) for the density-density response function is never accurate for the dipolar gas, and so we incorporate correlations beyond RPA via an improved version of the Singwi-Tosi-Land-Sjölander 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. © 2012 American Physical Society.
| Type: | Article |
|---|---|
| Title: | Density instabilities in a two-dimensional dipolar fermi gas |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.108.145304 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.108.145304 |
| Language: | English |
| Additional information: | © 2012 American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1332978 |
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