Chaos signatures of current phase transition in a toroidal trap
- URL: http://arxiv.org/abs/2309.06678v1
- Date: Wed, 13 Sep 2023 02:28:23 GMT
- Title: Chaos signatures of current phase transition in a toroidal trap
- Authors: Zhiqiang Li, Xiaoxiao Hu, Zhao-Yun Zeng, Yajiang Chen, Ai-Xi Chen, and
Xiaobing Luo
- Abstract summary: We show that due to the self-trapping effect in momentum space, the amplitude of the current can be significantly suppressed.
We also reveal numerically the mean-field chaos can serve as an indicator of a quantum phase transition between the vanishing current regime and nonvanishing current regime.
- Score: 1.8352247044444525
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In this work we demonstrate how the directed motion of atomic Bose-Einstein
condensates in a toroidal trap can be controlled by applying a zero-mean
oscillatory driving field. We show that due to the self-trapping effect in
momentum space, the oscillatory amplitude of the current can be significantly
suppressed and a nearly constant directed current can be obtained preserving
the initial current values, by decreasing the driving amplitude, even when the
atomic interactions are relatively small. We also reveal numerically the
mean-field chaos can serve as an indicator of a quantum phase transition
between the vanishing current regime and nonvanishing current regime. Our
results are corroborated by an effective three-mode model, which provides an
excellent account of the ratchet dynamics of the system.
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