4.6 Article

Supersolid phase of cold fermionic polar molecules in two-dimensional optical lattices

期刊

PHYSICAL REVIEW A
卷 83, 期 5, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.83.053629

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  1. German Science Foundation DFG [BL 574/10-1]

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We study a system of ultracold fermionic polar molecules in a two-dimensional square lattice interacting via both the long-range dipole-dipole interaction and a short-range on-site attractive interaction. Singlet-superfluid, change density wave, and supersolid phases are found to exist in the system. We map out the zero-temperature phase diagram and find that the supersolid phase is considerably stabilized by the dipole-dipole interaction and thus can exist over a large region of filling factors. We study the melting of the supersolid phase with increasing temperature, map out a finite-temperature phase diagram of the system at fixed filling, and determine the parameter region where the supersolid phase can possibly be observed in experiments.

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