期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 5, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac6cfd
关键词
Bose-Einstein condensate; synthetic gauge field; chaotic dynamics
资金
- Science Foundation of Guizhou Science and Technology Department [QKHJZ[2021]033, QKHJZ[2018]1178]
- Science Foundation of Guizhou Provincial Education Department [QJHKYZ[2017]087]
- National Natural Science Foundation of China [12004118]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515110228, 2021A1515010212]
- Science and Technology Program of Guangzhou [2019050001]
In this study, we investigated the impact of density-dependent gauge field on the collective dynamics of a harmonically trapped Bose-Einstein condensate (BEC). We found that, under strong coupling, the collective motion of a quasi-two-dimensional condensate can become chaotic.
In this work we study the effect of density-dependent gauge field on the collective dynamics of a harmonically trapped Bose-Einstein condensate (BEC), beyond the linear response regime. The density-dependent gauge field, as a backaction of the condensate, can in turn affect the condensate dynamics, resulting in highly nonlinear equations of motion. The dipole and breathing oscillations of the condensate along the direction of gauge field are coupled by this field. We find that, in the presence of this coupling, the collective motion of a quasi-one-dimensional condensate is still regular, i.e., periodic or quasiperiodic. In contrast, for a quasi-two-dimensional condensate, the collective dynamics of the condensate can become chaotic, when the density-dependent gauge field is strong. The mechanism is that the gauge field can also induce a Hall effect, manifested as an additional coupling between dipole and breathing oscillations in perpendicular direction, and chaotic motion is resulted from the interplay between these oscillations. Our findings reveal an important effect of dynamical gauge field on the nonlinear dynamics of a BEC.
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