Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Quantengase: Wechselwirkungseffekte 2

Q 39.5: Vortrag

Donnerstag, 15. März 2012, 11:45–12:00, V7.01

Regular to chaotic resonant tunneling — •Carlos Parra Murillo¹, Javier Madronero², and Sandro Wimberger¹ — ¹Institut für theoretische Physik, Heidelberg Universität, D-69120, Heidelberg — ²Physik Department, Technische Universität München, D-85747 Garching

The transport properties of flat optical lattices loaded with ultracold atoms have been amply studied in recent years in theory as well as in experiment. The introduction of a Stark force as a control parameter allows one the realization of resonant tunneling between energy levels in different potential wells. An example is the control of interband tunneling by the Stark force [1]. The latter effect is strongly modified by the presence of interparticle interaction. In this work we study this Wannier-Stark system based on a two-band Bose-Hubbard model. The spectrum is computed by exact numerical diagonanalization and studied as a function of the filling factor of the lattice, the order of the resonance and the potential parameters. The dynamical correlations between the bands imply interesting perspectives for the state-of-the-art experiments with ultracold bosons.
[1] Sias, C. Zenesini, A. Lignier, H. Wimberger, S. Ciampini, D. Morsch, O. and Arimondo, E., Phys. Rev. Lett. 98, 120403 (2007)