Dynamics of vortex quadrupoles in nonrotating trapped Bose-Einstein condensates

doi:10.1038/srep29066

	Dynamics of vortex quadrupoles in nonrotating trapped Bose-Einstein condensates
	Yang, Tao 1,2; Hu, Zhi-Qiang 1; Zou, Shan 3; Liu, Wu-Ming 4
刊名	Scientific Reports
	2016-07-28
卷号	6 页码:10
ISSN号	2045-2322
DOI	10.1038/srep29066
英文摘要	Dynamics of vortex clusters is essential for understanding diverse superfluid phenomena. In this paper, we examine the dynamics of vortex quadrupoles in a trapped two-dimensional (2D) Bose-Einstein condensate. We find that the movement of these vortex-clusters fall into three distinct regimes which are fully described by the radial positions of the vortices in a 2D isotropic harmonic trap, or by the major radius (minor radius) of the elliptical equipotential lines decided by the vortex positions in a 2D anisotropic harmonic trap. In the "recombination" and "exchange" regimes the quadrupole structure maintains, while the vortices annihilate each other permanently in the "annihilation" regime. We find that the mechanism of the charge flipping in the "exchange" regime and the disappearance of the quadrupole structure in the "annihilation" regime are both through an intermediate state where two vortex dipoles connected through a soliton ring. We give the parameter ranges for these three regimes in coordinate space for a specific initial configuration and phase diagram of the vortex positions with respect to the Thomas-Fermi radius of the condensate. We show that the results are also applicable to systems with quantum fluctuations for the short-time evolution.
资助项目	National Natural Science Foundation of China[11347025] ; National Natural Science Foundation of China[11434015] ; National Natural Science Foundation of China[61227902] ; National Natural Science Foundation of China[61378017] ; NKBRSFC[2012CB821305] ; SKLQOQOD[KF201403] ; SPRPCAS[XDB01020300] ; Science Foundation of Northwest University[13NW16]
WOS关键词	QUANTUM TURBULENCE ; SUPERFLUID-HELIUM ; VORTICES ; INTERFERENCE ; STABILITY ; LATTICES ; GASES ; LIGHT
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000380648900001
资助机构	National Natural Science Foundation of China ; NKBRSFC ; SKLQOQOD ; SPRPCAS ; Science Foundation of Northwest University
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/43114]
专题	中国科学院近代物理研究所
通讯作者	Yang, Tao; Liu, Wu-Ming
作者单位	1.Northwest Univ, Inst Modern Phys, Xian 710069, Peoples R China 2.Shaanxi Key Lab Theoret Phys Frontiers, Xian 710069, Peoples R China 3.Northwest Univ, Sch Phys, Xian 710069, Peoples R China 4.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Yang, Tao,Hu, Zhi-Qiang,Zou, Shan,et al. Dynamics of vortex quadrupoles in nonrotating trapped Bose-Einstein condensates[J]. Scientific Reports,2016,6:10.
APA	Yang, Tao,Hu, Zhi-Qiang,Zou, Shan,&Liu, Wu-Ming.(2016).Dynamics of vortex quadrupoles in nonrotating trapped Bose-Einstein condensates.Scientific Reports,6,10.
MLA	Yang, Tao,et al."Dynamics of vortex quadrupoles in nonrotating trapped Bose-Einstein condensates".Scientific Reports 6(2016):10.