Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 3: Quantum gases: Interaction effects I

Q 3.3: Vortrag

Montag, 18. März 2013, 11:45–12:00, E 001

Interband transport in a many-body Wannier-Stark setup — •Carlos Alberto Parra-Murillo¹, Javier Madroñ ero², and Sandro Wimberger¹ — ¹Institut für Theoretische Physik and Center for Quantum Dynamics, Universität Heidelberg, 69120 Heidelberg, Germany — ²Physik Department, Technische Universität München, 85747 Garching, Germany

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, especially under single band approximation. The coupling to higher Bloch bands can be introduced by a Stark force, which can be considered as a control parameter. This allows the realization of resonant tunneling between energy levels in different potential wells. We study a Wannier-Stark system based on a two-band Bose-Hubbard model. The spectral characteristics of this system in the regime of strong interparticle interaction offer the possibility of a dynamical preparation of specific upper band states and also the study of quench dynamics across the spectrum [1]. Dynamical correlations between the bands imply interesting perspectives for the state-of-the-art experiments with ultracold bosons.

[1] Parra-Murillo C. A., Madronero J., Wimberger S., arXiv:1207.4699 [cond-mat.quant-gas] (2012)