Abstract
By selecting two dressed rotational states of ultracold polar molecules in an optical lattice, we obtain a highly tunable generalization of the model, which we refer to as the model. In addition to 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 model enable enhanced superfluidity. Finally, we show that Bloch oscillations in a tilted lattice can be used to probe the phase diagram experimentally.
- Received 9 June 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.115301
© 2011 American Physical Society
Synopsis
Quantum magnetism with polar molecules
Published 15 September 2011
Researchers propose using ultracold polar molecules to simulate the - model, the cornerstone of many theoretical efforts to understand high-temperature superconductivity.
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