# Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules

 Title: Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules Author: Manmana, Salvatore; Chen, Gang; Ye, Jun; Rey, Ana; Gorshkov, Alexey Vyacheslavovich; Demler, Eugene A.; Lukin, Mikhail D. Note: Order does not necessarily reflect citation order of authors. Citation: Gorshkov, Alexey, Salvatore Manmana, Gang Chen, Jun Ye, Eugene Demler, Mikhail Lukin, and Ana Rey. 2011. Tunable superfluidity and quantum magnetism with ultracold polar molecules. Physical Review Letters 107(11): 115301. Full Text & Related Files: 1106.1644v1.pdf (453.8Kb; PDF) Abstract: 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 novel 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 (DMRG) 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. Published Version: doi:10.1103/PhysRevLett.107.115301 Other Sources: http://arxiv.org/abs/1106.1644 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8148862 Downloads of this work: