Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Ultra-cold atoms, ions and BEC V (with Q)

A 20.1: Vortrag

Donnerstag, 17. März 2011, 10:30–10:45, BAR 106

Supersolid Phase of Cold Fermionic Polar Molecules in 2D Optical Lattices — •Liang He and Walter Hofstetter — Institut für Theoretische Physik, Johann Wolfgang Goethe–Universität, 60438 Frankfurt/Main, Germany

The recent successful realization of a degenerate quantum gas of fermionic polar molecules of 40K87Rb [1] opens the door towards exploring the interesting many-body physics originating from the dipole-dipole interactions in fermionic systems. Here we investigate a system of ultra-cold fermionic polar molecules in a two-dimensional square lattice interacting via both the long-ranged dipole-dipole interaction and the short-ranged on-site attractive interaction. Singlet superfluid, charge density wave, and supersolid phases are found to exist in the system. We map out the zero temperature phase diagram and find that the supersolid phase is considerably stabilized by the dipole-dipole interaction and can thus exist over a large region of filling factors. At finite temperatures, we study the melting of the supersolid with increasing temperature, map out a finite temperature phase diagram of the system at a fixed filling factor, and determine the parameter region where the supersolid phase can be possibly observed in experiments.

[1] K.-K. Ni, S. Ospelkaus, M. H. G. de Miranda, A. Pe’er, B. Neyenhuis, J. J. Zirbel, S. Kotochigova, P. S. Julienne, D. S. Jin, and J. Ye, Science, 322, 231 (2008).

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