首页|Dynamical nonlinear excitations induced by interaction quench in a two-dimensional box-trapped Bose-Einstein condensate

Dynamical nonlinear excitations induced by interaction quench in a two-dimensional box-trapped Bose-Einstein condensate

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Manipulating nonlinear excitations,including solitons and vortices,is an essential topic in quantum many-body physics.A new progress in this direction is a protocol proposed in[Phys.Rev.Res.2 043256(2020)]to produce dark solitons in a one-dimensional atomic Bose-Einstein condensate(BEC)by quenching inter-atomic interaction.Motivated by this work,we generalize the protocol to a two-dimensional BEC and investigate the generic scenario of its post-quench dynamics.For an isotropic disk trap with a hard-wall boundary,we find that successive inward-moving ring dark solitons(RDSs)can be induced from the edge,and the number of RDSs can be controlled by tuning the ratio of the after-and before-quench interaction strength across different critical values.The role of the quench played on the profiles of the den-sity,phase,and sound velocity is also investigated.Due to the snake instability,the RDSs then become vortex-antivortex pairs with peculiar dynamics managed by the initial density and the after-quench interaction.By tuning the geometry of the box traps,demonstrated as polygonal ones,more subtle dynamics of solitons and vortices are enabled.Our pro-posed protocol and the discovered rich dynamical effects on nonlinear excitations can be realized in near future cold-atom experiments.

Bose-Einstein condensatequench interactionsolitonvortex

牛真霞、高超

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Department of Physics,Zhejiang Normal University,Jinhua 321004,China

Key Laboratory of Optical Information Detection and Display Technology of Zhejiang,Zhejiang Normal University,Jinhua 321004,China

Natural Science Foundation of Zhejiang Province of ChinaNatural Science Foundation of Zhejiang Province of ChinaNatural Science Foundation of Zhejiang Province of ChinaNatural Science Foundation of Zhejiang Province of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

LQ22A040006LY21A040004LR22A040001LZ21A0400011183501112074342

2024

10.1088/1674-1056/ad1179

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(2)
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