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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster IV
Q 56.17: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Inter-species tunneling in Bose-Bose mixtures — •Anika Carmen Pflanzer1, Sascha Zöllner2, and Peter Schmelcher1,2 — 1Universität Heidelberg, Physikalisches Institut, Philosophenweg 12, 69120 Heidelberg — 2Universität Heidelberg, Theoretische Chemie, Im Neuenheimer Feld 229, 69120 Heidelberg
We study ultracold Bose-Bose mixtures in one-dimensional harmonic traps. The few-body dynamics are investigated based on the numerically exact multiconfiguration time-dependent Hartree method. If the effective mass of one of the species is infinitely large, it becomes completely localized in the center of the trap. In this limit, we can map the problem onto an effective double well for the lighter species. The intra-species interaction of the lighter bosons is varied, covering the full range from weak interactions to the fermionization limit. Starting from Rabi oscillations in the non-interacting case, correlated pair tunneling begins for weak interactions and leads to a dynamical behavior governed by two Rabi-like frequencies in the fermionization limit. Small deviations from the infinite-mass requirement allow the heavier bosons to move and thus affect the tunneling dynamics. In the opposite borderline case of equal masses, a completely different behavior arises and thermalization effects are investigated.