Liquid and Crystal Phases of Dipolar Fermions in Two Dimensions

Year: 2012

Authors: Matveeva N., Giorgini S.

Autors Affiliation: Univ Trent, Dipartimento Fis, I-38050 Povo, Trento, Italy; CNR INO BEC Ctr, I-38050 Povo, Trento, Italy.

Abstract: The liquid and crystal phases of a single-component Fermi gas with dipolar interactions are investigated using quantum Monte Carlo methods in two spatial dimensions and at zero temperature. The dipoles are oriented by an external field perpendicular to the plane of motion, resulting in a purely repulsive 1/r(3) interaction. In the liquid phase we calculate the equation of state as a function of the interaction strength and other relevant properties characterizing the Fermi-liquid behavior: effective mass, discontinuity at the Fermi surface, and pair correlation function. In the high density regime we calculate the equation of state of the Wigner crystal phase and the critical density of the liquid to solid quantum phase transition. Close to the freezing density we also search for the existence of a stripe phase, but such a phase is never found to be energetically favorable.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 109 (20)      Pages from: 200401-1  to: 200401-5

More Information: Useful discussions with G. Astrakharchik, M. Holzmann, and M. Capone are gratefully acknowledged. This work has been supported by ERC through the QGBE grant. Calculations were performed on the AURORA supercomputer at Fondazione Bruno Kessler.
KeyWords: Polar-molecules; State
DOI: 10.1103/PhysRevLett.109.200401

Citations: 55
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