Phys. Rev. Lett. 104, 125301 (2010) [4 pages]Quantum Phases of Cold Polar Molecules in 2D Optical LatticesReceived 11 June 2009; revised 22 February 2010; published 25 March 2010 We study the quantum phases of hard-core bosonic polar molecules on a two-dimensional square lattice interacting via repulsive dipole-dipole interactions. In the limit of small tunneling, we find evidence for a devil’s staircase, where Mott solids appear at rational fillings of the lattice. For finite tunneling, we establish the existence of extended regions of parameters where the ground state is a supersolid, obtained by doping the solids either with particles or vacancies. We discuss the effects of finite temperature and finite-size confining potentials as relevant to experiments. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.125301
DOI:
10.1103/PhysRevLett.104.125301
PACS:
67.85.-d, 03.75.-b, 05.30.-d
See AlsoSee Also: L. Pollet, J. D. Picon, H. P. Büchler, and M. Troyer, Supersolid Phase with Cold Polar Molecules on a Triangular Lattice, Phys. Rev. Lett. 104, 125302 (2010). |
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