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Journal of Optics B Quantum and Semiclassical Optics

Effects of atomic interactions on the resonant tunnelling of sodium condensates

Davide Embriaco, Maria Luisa Chiofalo, M. Artoni, Giuseppe Carlo La Rocca

Published Mar 1, 2005• 2 citations
Publisher

Abstract

We investigate the influence of atomic interactions on the tunnelling of sodium condensates across a spatially oscillating optical barrier. In the limit of very fast barrier oscillations, in which resonant tunnelling via a metastable state takes place, the interactions affect the position and lineshape of the transmission peak. We anticipate that the possibility of modulating the interactions in a tunnelling condensate can be exploited to achieve nonlinear effects such as optical limiting and bistability.

DOI
10.1088/1464-4266/7/3/008

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We study tunneling dynamics of atomic pairs in Bose-Einstein condensates with Feshbach resonances. It is shown that the tunneling of the atomic pairs depends on not only the tunneling coupling between the atomic condensate and the molecular condensate, but also the interatomic nonlinear interactions and the initial number of atoms in these condensates. It is found that in addition to oscillating tunneling current between the atomic condensate and the molecular condensate, the nonlinear atomic-pair tunneling dynamics sustains a self-locked population imbalance: a macroscopic quantum self-trapping effect. The influence of decoherence induced by noncondensate atoms on the tunneling dynamics is investigated. It is shown that decoherence suppresses atomic-pair tunneling.
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