Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Transport and Localization of interacting Bosons 1
Q 40.1: Vortrag
Mittwoch, 16. März 2011, 16:30–16:45, HSZ 02
Observation of Absolute Negative Mobility in Driven Quantum Systems — •Tobias Salger1, Sebastian Kling1, Sergey Denisov2, Alexey Ponomarev2, Peter Hänggi2, and Martin Weitz1 — 1Institut für Angewandte Physik, Wegelerstrasse 8, 53115 Bonn — 2Institut für Physik, Universitätsstrasse 1, 86135 Augsburg
Here we report on the observation of absolute negative mobility (ANM) of a Bose-Einstein condensate in an ac-driven quantum system. This effect describes the paradoxial situation, when the motion of a particle is always in oppositve direction to an applied external gradient field. Based on successful experiments, demonstrating a directed motion of a Bose-Einstein condensate in a Hamiltonian quantum ratchet, we investigate the dynamics of atoms when exerted to an external bias field [1].
Up to now,
the presence of strong decoherence mechanisms has been considered to be crucial
for absolute negative mobility [2]. However here we demonstrate for the first time
that this phenomenon can also be observed in a coherent quantum system. Our experimental
results are in good agreement with a theoretical model, based on numerical simulations.
T. Salger et al., Science 326, 1241 (2009)
A. Ros et al., Nature 436, 928 (2005)