二维箱阱玻色-爱因斯坦凝聚态中由相互作用淬火诱发的动态非线性激变

IF 1.5 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Zhen-Xia Niu, Chao Gao
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引用次数: 0

摘要

操纵非线性激起(包括孤子和旋涡)是量子多体物理学的一个重要课题。Phys. Rev. Res.2 043256 (2020)]中提出的一个协议,通过淬灭原子间相互作用,在一维原子玻色-爱因斯坦凝聚态(BEC)中产生暗孤子,是这方面的一个新进展。受这项工作的启发,我们将协议推广到二维 BEC,并研究了其淬火后动力学的一般情况。对于具有硬壁边界的各向同性圆盘陷阱,我们发现可以从边缘诱导出连续向内移动的环暗孤子(RDS),并且可以通过调整淬火后与淬火前相互作用强度在不同临界值上的比率来控制 RDS 的数量。此外,还研究了淬火对密度、相位和声速剖面的作用。由于蛇形不稳定性,RDS 随后会变成涡旋-反涡旋对,其特殊的动态受初始密度和淬火后相互作用的影响。通过调整盒式陷阱的几何形状(如多边形陷阱),可以实现更微妙的孤子和涡旋动力学。我们提出的协议和发现的对非线性激起的丰富动力学效应可以在不久的将来的冷原子实验中实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dynamical nonlinear excitations induced by interaction quench in a two-dimensional box-trapped Bose–Einstein condensate
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 density, 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 proposed protocol and the discovered rich dynamical effects on nonlinear excitations can be realized in near future cold-atom experiments.
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来源期刊
Chinese Physics B
Chinese Physics B 物理-物理:综合
CiteScore
2.80
自引率
23.50%
发文量
15667
审稿时长
2.4 months
期刊介绍: Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.
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