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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Low-Dimensional Systems - Models 3

TT 25.5: Vortrag

Dienstag, 12. März 2013, 10:30–10:45, H9

Tunable Superconductivity with Ultracold Polar Molecules and Enhanced Superconducting Phases in dipolar t−J_⊥ chains — •Salvatore R. Manmana^1,2, Kaden R.A. Hazzard², Gang Chen², Alexey V. Gorshkov³, and Ana Maria Rey² — ¹Institut für Theoretische Physik, Universität Göttingen, Germany — ²JILA, University of Colorado and NIST, and Department of Physics, CU Boulder, USA — ³Institute for Quantum Information & Matter, Caltech, Pasadena, California, USA

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 of them ∼ 1/r³. Full control of all interaction parameters in both magnitude and sign can be achieved independently of each other and of the tunneling. We apply the density matrix renormalization group method to obtain the 1D phase diagram in the case of nearest neighbor hopping and long-range transverse spin-exchange J_⊥. The anisotropy in the spin-exchange and the long-range nature of the interactions lead to an enhanced superconducting phase. We discuss that the long-range interactions despite the presence of a gap lead to an algebraically decaying contribution to correlation functions.