Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 2: Ultra-cold atoms, ions and BEC I (with Q)

A 2.6: Talk

Monday, March 14, 2011, 11:45–12:00, BAR 106

Rotons and Supersolids in Rydberg-dressed BECs — •Nils Henkel and Thomas Pohl — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden

We study a BEC where atoms are off-resonantly coupled to high Rydberg states with strong van der Waals interaction. We find that this leads to effective ground state interactions which, in turn, lead to the formation of a crystalline structure in the BEC. Comparisons to Quantum Monte Carlo simulations at finite temperatures demonstrate the survival of a significant superfluid fraction, i.e. the emergence of a Supersolid state in the BEC. This excellent agreement proves the applicability of our Mean-Field theory. Therefore, we then extend our Mean-Field investigation to rotating BECs and find similar structures as in the stationary case. There appears however a nontrivial competition between supersolid order and an Abrikosov vortex lattice due to rotation. Shedding light on this competition, the resulting phase diagram will be discussed.