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DY: Fachverband Dynamik und Statistische Physik
DY 15: ISPS Intersectional Poster Session
DY 15.2: Poster
Dienstag, 15. März 2011, 18:00–20:00, P1
Interaction-induced fractional Bloch and tunneling oscillations — •Dmitry Krimer1,2, Ramaz Khomeriki1,3, Masudul Haque1, and Sergej Flach1 — 1Max Planck Institute for the Physics of Complex Systems, 01189 Dresden, Germany — 2Institute for Theoretical Physics, University of Tuebingen, 72076 Tübingen — 3Physics Department, Tbilisi State University, 0128 Tbilisi, Georgia
We study the dynamics of few interacting bosons in a one-dimensional lattice with dc bias in the framework of Bose-Hubbard model [1]. The resulting dynamics turned out to be substantially different than that obtained within the mean-field approximation valid for the description of Bose-Einstein condensates [2]. In particular, for strong interaction the Bloch oscillation regime reemerges with fractional Bloch periods, which are inversely proportional to the number of bosons clustered into a bound state. The interaction strength is affecting the oscillation amplitude. Excellent agreement is found between numerical data and a composite particle dynamics approach. For specific values of the interaction strength a particle tunnels from the interacting cloud to a well defined distant lattice location. This is in contrast to the case of the mean-field approach, where any nonlinearity destroys integrability, introduces chaos, and ultimately leads to a destruction of localization [2].
[1] R. Khomeriki, D.O. Krimer, M. Haque, S. Flach, Phys. Rev. A 81, 065601 (2010)
[2] D.O. Krimer, R. Khomeriki, S. Flach, Phys. Rev. E 80, 036201 (2009)