Gorshkov, Alexey V. and Manmana, Salvatore R. and Chen, Gang and Ye, Jun and Demler, Eugene and Lukin, Mikhail D. and Rey, Ana Maria (2011) Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules. Physical Review Letters, 107 (11). p. 115301. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20110929-105922346
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By selecting two dressed rotational states of ultracold polar molecules in an optical lattice, we obtain a highly tunable generalization of the t-J model, which we refer to as the t-J-V-W model. In addition to XXZ spin exchange, the model features density-density interactions and density-spin interactions; all interactions are dipolar. We show that full control of all interaction parameters in both magnitude and sign can be achieved independently of each other and of the tunneling. As a first step towards demonstrating the potential of the system, we apply the density matrix renormalization group method to obtain the 1D phase diagram of the simplest experimentally realizable case. Specifically, we show that the tunability and the long-range nature of the interactions in the t-J-V-W model enable enhanced superfluidity. Finally, we show that Bloch oscillations in a tilted lattice can be used to probe the phase diagram experimentally.
|Additional Information:||© 2011 American Physical Society. Received 9 June 2011; published 8 September 2011. We thank A. Muramatsu, M. Troyer, A. Moreno, D. Jin, G. Refael, J. Aldegunde, P. Julienne, M. Babadi, I. Bloch, P. Rabl, G. Quéméner, A. Potter, B. Wunsch, P. Zoller, S. Pielawa, E. Berg, A. Daley, F. Mila, R. Noack, and H. Weimer for discussions. This work was supported by the NSF, NIST, the Lee A. DuBridge Foundation, the ARO with funding from DARPA-OLE, CUA, and AFOSR MURI. We acknowledge CPU time at ARSC.|
|Group:||Institute for Quantum Information and Matter, IQIM|
|Classification Code:||PACS: 67.85.-d, 33.80.-b, 71.10.Fd, 71.10.Pm|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||04 Oct 2011 17:18|
|Last Modified:||26 Dec 2012 13:43|
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