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TT: Fachverband Tiefe Temperaturen

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

TT 41.3: Talk

Thursday, March 26, 2009, 14:30–14:45, HSZ 105

Superfluid Boson Currents and Long Range Interactions in 1D Lattices — •Johannes Schachenmayer — Institut für Theoretische Physik, Technikerstr. 26, 6020 Innsbruck, Austria

The decay of superfluid currents for bosons moving in an optical lattice potential has attracted a lot of recent attention. In particular, experiments have shown that the decay of currents in 1D systems differs markedly from the mean-field prediction. We investigate this system here, computing the time evolution within the Bose-Hubbard model using the infinite Time Evolving Block Decimation Algorithm, and find good agreement with the experimental results. We further report on progress in extending the algorithm to allow simulation of long-range interactions.