Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantengase: Gitter und Tunneln II
Q 51.6: Vortrag
Donnerstag, 5. März 2009, 17:45–18:00, Audi-A
Theoretical Investigation of a Hamiltonian Quantum Ratchet — •Tim Hecking1, Luis Morales-Molina2, Tobias Salger1, Carsten Geckeler1, Sebastian Kling1, and Martin Weitz1 — 1Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany — 2Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
We study the dynamics of a Bose-Einstein condensate in a quantum ratchet,
that consists of a biharmonic, amplitude modulated potential in the absence of dissipation (Hamiltonian regime) [1].
The system considered here exhibits negligible atom-atom interaction, therefore
the results can be obtained by numerical integration of the linear Schrödinger equation.
Of particular interest is the dependence of the atomic mean momentum on critical parameters, such
as the modulation period and the symmetry properties of the system.
By comparison of our theoretical model with the results of an experimentally realized quantum ratchet [2], good agreement is achieved.
S. Denisov et al., Phys. Rev. A 75, 063424 (2007)
T. Salger et al., to be published