Many-body quantum ratchet in a Bose-Einstein condensate
Dario Poletti, Giuliano Benenti, Giulio Casati, Baowen Li
TL;DR
This paper investigates how many-body interactions in a Bose-Einstein condensate can break quantum symmetries and induce directed transport in a system with periodically flashed optical lattices.
Contribution
It demonstrates that atom-atom interactions within a mean-field framework can break quantum symmetry and enable a quantum ratchet effect in a Bose-Einstein condensate.
Findings
Quantum symmetry prevents ratchet effect in noninteracting case
Interactions break symmetry and induce directed transport
Mean-field approximation captures the interaction-induced ratchet phenomenon
Abstract
We study the dynamics of a dilute Bose-Einstein condensate confined in a toroidal trap and exposed to a pair of periodically flashed optical lattices. We first prove that in the noninteracting case this system can present a quantum symmetry which forbids the ratchet effect classically expected. We then show how many-body atom-atom interactions, treated within the mean-field approximation, can break this quantum symmetry, thus generating directed transport.
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