Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 31: Ultra-Cold Atoms, Ions and BEC IV (with Q)

A 31.2: Fachvortrag

Donnerstag, 5. März 2009, 17:00–17:30, VMP 6 HS-C

Ultracold chaos – strongly coupled bosons — •Sandro Wimberger — Institut für Theoretische Physik, Universität Heidelberg — Heidelberger Graduiertenschule für Fundamentale Physik

Modern atom-optics experiments allow one an unprecedented control of atomic degrees of freedom and, as a consequence, the clean realization of toy models used to explain transport phenomena in condensed matter physics. We present recent results on extended Bose-Hubbard systems. For reasonable lattice sizes, this model gives access to the full quantum spectrum, which allows us a complete characterization of “horizontal” (spatially) and “vertical” (energetic) quantum transport. Various dynamical regimes can be prepared, using atom-atom interactions, disorder, and external forces as control parameters. We show that the interband transport of atoms – confined to a periodic lattice and subject to an additional tilting force – is strongly dependent on the dynamics of the ground-state band. Analogies between Stark localisation and Anderson localisation are discussed, as well as predictions for experiments to observe signatures of complex interband dynamics with ultracold atoms.