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TT: Fachverband Tiefe Temperaturen

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

TT 41.1: Vortrag

Donnerstag, 26. März 2009, 14:00–14:15, HSZ 105

Dynamics of Interacting Bose-Bose Mixtures in an Optical Lattice — •Julia Wernsdorfer, Michiel Snoek, and Walter Hofstetter — Institut für Theoretische Physik, Goethe-Universität, D-60438 Frankfurt, Germany

We investigate a bosonic quantum gas consisting of two interacting species in a two-dimensional optical lattice. The equilibrium properties and dynamics of this system are obtained by means of the Gutzwiller method. In particular we study the ramp-up of the optical lattice, which occurs on a time scale comparable to the tunneling time of the bosons. We investigate the adiabaticity of this process with respect to the many body quantum states to analyze whether the bosonic gas is in an equilibrium state when time-of-flight measurements are carried out. The effect of finite temperature is investigated by extending the time-dependent Gutzwiller method to T>0.