d-wave superfluidity in optical lattices of ultracold polar molecules

Kevin A. Kuns, Ana Maria Rey, and Alexey V. Gorshkov
Phys. Rev. A 84, 063639 – Published 29 December 2011

Abstract

Recent work on ultracold polar molecules, governed by a generalization of the t-J Hamiltonian, suggests that molecules may be better suited than atoms for studying d-wave superfluidity due to stronger interactions and larger tunability of the system. We compute the phase diagram for polar molecules in a checkerboard lattice consisting of weakly coupled square plaquettes. In the simplest experimentally realizable case where there is only tunneling and an XX-type spin-spin interaction, we identify the parameter regime where d-wave superfluidity occurs. We also find that the inclusion of a density-density interaction destroys the superfluid phase and that the inclusion of a spin-density or an Ising-type spin-spin interaction can enhance the superfluid phase. We also propose schemes for experimentally realizing the perturbative calculations exhibiting enhanced d-wave superfluidity.

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  • Received 24 October 2011

DOI:https://doi.org/10.1103/PhysRevA.84.063639

©2011 American Physical Society

Authors & Affiliations

Kevin A. Kuns1, Ana Maria Rey2, and Alexey V. Gorshkov1

  • 1Institute for Quantum Information, California Institute of Technology, Pasadena, California 91125, USA
  • 2JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440 and Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA

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Vol. 84, Iss. 6 — December 2011

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