Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Quantum Liquids, Bose-Einstein Condensates, Ultracold Atoms, ...
TT 25.7: Vortrag
Donnerstag, 29. März 2007, 15:30–15:45, H18
Coherent Matter Waves Emerging from Mott-Insulators — Karen Rodriguez1, •Salvatore Manmana1,2,3, Marcos Rigol4, Reinhard Noack2, and Alejandro Muramatsu1 — 1Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart — 2AG Vielteilchennumerik, Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg — 3Institute of Theoretical Physics, EPFL, CH-1015 Lausanne (Switzerland) — 4Physics Department, University of California, Davis, CA 95616 (USA)
Using the adaptive time-dependent density matrix renormalization group method (adaptive t-DMRG), we investigate the non-equilibrium dynamics of a system of strongly interacting soft-core bosons on a one-dimensional lattice modelled by the bosonic Hubbard model. We study the formation of (quasi-)coherent matter waves emerging from an initial Mott insulator state. It has been shown previously that a quasi-condensate emerges at momentum kcond = π/2a, where a is the lattice constant, in the limit of infinitely strong repulsion (hard-core bosons). Here we show that this phenomenon persists for all values of the repulsive interaction that lead to a Mott insulator at a commensurate filling. Different methods for tuning the wave vector of the emerging matter wave are discussed.