Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 15: Controlling Dirty Bosons: Disorder Effects on BECs

DY 15.6: Vortrag

Dienstag, 26. Februar 2008, 15:45–16:00, MA 001

Critical Temperature of Dirty Bosons — •Ben Klünder, Axel Pelster, and Robert Graham — Fachbereich Physik, Universität Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany

We consider a dilute Bose gas moving in a harmonic trap with a superimposed frozen random potential which arises in experiments either artifically with laser speckles or naturally in wire traps. The critical temperature, which characterizes the onset of Bose-Einstein condensation, depends on the disorder realization within the ensemble. Therefore, we introduce an effective grand-canonical potential from which we determine perturbatively the disorder averages of both the first and second moment of the critical temperature in leading order. We discuss our results for a finite number of particles by assuming a Gaussian spatial correlation for the quenched disorder potential.