Kuns, Kevin A. and Rey, Ana Maria and Gorshkov, Alexey V. (2011) d-wave superfluidity in optical lattices of ultracold polar molecules. Physical Review A, 84 (6). Art. No. 063639. ISSN 1050-2947 http://resolver.caltech.edu/CaltechAUTHORS:20120131-095541817
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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.
|Additional Information:||© 2011 American Physical Society. Received 24 October 2011; published 29 December 2011. We thank Maciej Lewenstein for suggesting the use of extra splittings between rotor levels to access the perturbative regime described in Sec. VB. We also thank John Preskill, Rajdeep Sensarma, Salvatore Manmana, Kaden Hazzard, Mikhail Lukin, Eugene Demler, Netanel Lindner, Norbert Schuch, Steven Flammia, Spyridon Michalakis, Gang Chen, Michael Foss-Feig, and Xiao Yin for discussions. This work was supported by the Rose Hills Foundation, the Lee A. DuBridge Foundation, the NSF (PFC and Grants No. PHY-0803371 and PIF-0904017), and ARO with funding from the DARPA OLE program.|
|Group:||Institute for Quantum Information and Matter, IQIM|
|Classification Code:||PACS: 67.85.-d, 71.10.Fd, 74.20.Mn, 74.20.Rp|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||01 Feb 2012 19:37|
|Last Modified:||26 Dec 2012 14:45|
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