Quantum Phases of Cold Polar Molecules in 2D Optical Lattices

Details Quantum Phases of Cold Polar Molecules in 2D Optical Lattices Quantum Phases of Cold Polar Molecules in 2D Optical Lattices

2009-06-10

arxiv.org/abs/0906.2009v2

Phys. Rev. Lett. 104, 125301 (2010)

Physics

Condensed Matter

Statistical Mechanics

replaced with published version

Scientific paper

We discuss the quantum phases of hard-core bosons on a two-dimensional square lattice interacting via repulsive dipole-dipole interactions, as realizable with polar molecules trapped in optical lattices. In the limit of small tunneling, we find evidence for a devil's staircase, where solid phases appear at all rational fillings of the underlying lattice. For finite tunneling, we establish the existence of extended regions of parameters where the groundstate is a supersolid, obtained by doping the solids either with particles or vacancies. Here the solid-superfluid quantum melting transition consists of two consecutive second-order transitions, with a supersolid as the intermediate phase. The effects of finite temperature and confining potentials relevant to experiments are discussed.

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