Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 15: Controlling Dirty Bosons: Disorder Effects on BECs

DY 15.9: Vortrag

Dienstag, 26. Februar 2008, 16:30–16:45, MA 001

Stochatical Mean Field Theory for the Disordered Bose Hubbard Model — •Ulf Bissbort and Walter Hofstetter — Institut für Theoretische Physik, JWG Universität Frankfurt am Main

We develop a systematic extension of the usual site decoupling mean field theory for the disordered Bose Hubbard model, extending the self-consistency condition to account for disorder induced inhomogeneity of the mean field parameter, by using a probability distribution. This method is capable of describing the Bose glass in the thermodynamic limit at T=0 and recovers the usual MFT in the limit of vanishing disorder, as well as the arithmetically averaged MFT in the limit of infinite dimensions, where the Bose glass border shifts to JZ=0. Phase diagrams are presented for a box disorder distribution and the limit of strong disorder is discussed.