Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Solids At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 16.1: Vortrag

Dienstag, 28. März 2006, 09:30–09:45, HSZ 105

Slave-boson approach for Bose-Einstein condensate in optical lattices — •Christopher Moseley and Klaus Ziegler — Institut für Physik, Universität Augsburg, 86135 Augsburg

A strongly interacting Bose-Einstein condensate in an optical lattice is treated by applying a slave-boson approach to hard-core bosons. A mean-field calculation for the condensate wave function leads to a renormalized Gross-Pitaevskii theory that describes both the dilute regime (like the conventional Gross-Pitaevskii equation) and the dense regime. Finite temperature effects as well as the phase transition to the Mott insulating state are found within this approach. Moreover, we calculate the quasiparticle excitation spectrum that in the dilute regime agrees with Bogoliubov theory.