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 16.5: Vortrag
Dienstag, 28. März 2006, 10:30–10:45, HSZ 105
Generation of coherent matter waves from correlated insulators — •Karen Rodriguez1, Salvatore Manmana1,2, Marcos Rigol3, Reinhard Noack2, and Alejandro Muramatsu1 — 1Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57 / V, 70550 Stuttgart — 2AG Vielteilchennumerik, Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg, Germany — 3Physics Department, University of California, Davis, CA 95616, USA
We study the evolution of matter waves resulting from the free expansion of an initially confined Mott-insulator, using a variant of the time-dependent density matrix renormalization group method (DMRG) that approximates the time-evolution operator within a Krylov subspace. A carefull comparison with the exact solution in the case of hard-core bosons [1] is performed, in order to determine the limitations of the algorithm. Finally, we discuss the expansion of soft-core bosons.
[1] [t]12.5cm M. Rigol and A. Muramatsu, Phys. Rev. Lett. 93, 230404 (2004); ibid. 94, 240403 (2005).