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Dynamics of interacting atoms in driven tilted optical lattices

Andrey R. Kolovsky^ab, Hans Jürgen Korsch<sup>c

a</sup> Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russia
^b Siberian Federal University, Krasnoyarsk, Russia
^c Fachbereich Physik, Technische Universität Kaiserslautern, Kaiserslautern, Germany

Abstract: The dynamics of cold Bose atoms in driven tilted optical lattices is analyzed focusing on destruction of Wannier-Stark localization and the phenomenon of band collapse. It is argued that an understanding of the experimental results requires thorough account for interaction effects. These are suppression of the ballistic spreading of atoms for resonant driving (a multiple of the driving frequency coincides with the Bloch frequency) and unbounded sub-diffusive spreading of atoms for off-resonant driving.

Keywords: cold atoms, optical latties, Bloch oscillations, self-trapping.

UDC: 538.94

Received: 10.04.2010
Received in revised form: 10.05.2010
Accepted: 10.06.2010

Language: English