[en] The coherent flow of a Bose-Einstein condensate through a quantum dot in a magnetic waveguide is studied. By the numerical integration of the time-dependent Gross-Pitaevskii equation in the presence of a source term, we simulate the propagation process of the condensate through a double barrier potential in the waveguide. We find that resonant transport is suppressed in interaction-induced regimes of bistability, where multiple scattering states exist at the same chemical potential and the same incident current. We demonstrate, however, that a temporal control of the external potential can be used to circumvent this limitation and to obtain enhanced transmission near the resonance on experimentally realistic time scales.
Disciplines :
Physics
Author, co-author :
Paul, T.
Richter, K.
Schlagheck, Peter ; Université de Liège - ULiège > Département de physique > Physique quantique statistique
Language :
English
Title :
Nonlinear resonant transport of Bose-Einstein condensates
Publication date :
2005
Journal title :
Physical Review Letters
ISSN :
0031-9007
eISSN :
1079-7114
Publisher :
American Physical Society, Ridge, United States - New York
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Such a small barrier width would be at the limit of realizability with present-day atom-chip technology. We remark, however, that the phenomena we discuss here do not sensitively depend on the chosen parameters nor on the specific shape of the potential.
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In atom chips, time-dependent fluctuations of the barrier height might further reduce the lifetime. This issue is currently under investigation.
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