Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Matter at Low Temperature: Quantum Liquids, Bose-Einstein-Condensates, Ultra-cold Atoms

TT 41.5: Vortrag

Donnerstag, 26. März 2009, 15:00–15:15, HSZ 105

Cold bosonic atoms in a π – flux lattice:
a superfluid with orbital antiferromagnetic order
— •Stephan Rachel and Martin Greiter — Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe

We consider a system of neutral, bosonic atoms on a square lattice subject to an artificial magnetic field. We focus on a field strength of half a Dirac flux quantum through every plaquette, which implies two minima in the lower single particle band. For repulsive interactions, we show that the many particle ground state possesses both superfluid and orbital antiferromagnetic order. For attractive interactions, we find a fragmented Bose–Einstein condensate without net orbital currents.