We analyze vortex nucleation in mezoscopic 2D Bose superfluid in a rotating trap. We explicitly include a weakly anisotropic stirring potential, breaking thus explicitly the axial symmetry. As the rotation frequency passes the critical value $Ω_c$ the system undergoes an extra symmetry change/breaking. Well below $Ω_c$ the ground state is properly described by the mean field theory with an even condensate wave function. Well above $Ω_c$ the MF solution works also well, but the order parameter becomes odd. This phenomenon involves therefore a discrete parity symmetry breaking. In the critical region the MF solutions exhibit dynamical instability. The true many body state is a strongly correlated entangled state involving two macroscopically occupied modes (eigenstates of the single particle density operator). We characterize this state in various aspects: i) the eligibility for adiabatic evolution; ii) its analytical approximation given by the maximally entangled combination of two single modes; and finally iii) its appearance in particle detection measurements.
Minimal superfluid vortices in chiral perturbation theory
Centro de Estudios Científicos (CECS)(科学研究中心);Universidad San Sebastián, sede Valdivia(塞巴斯蒂安大学瓦尔迪维亚校区);Universidad de Concepción (UDEC)(康塞普西翁大学);Laboratori Nazionali del Gran Sasso, INFN(格兰萨索国家实验室,意大利国家核物理研究所)
Out-of-phase oscillation between superfluid and thermal components for a trapped Bose condensate under oscillatory excitation
由振荡磁场诱导的涡旋成核和量子湍流的出现,由Henn E A L等人2009(Phys. Rev. A 79,043619)和Henn E A L等人2009(Phys. Rev. Lett. 103,045301),留下了一些悬而未决的问题,有关的基本机制,造成这些有趣的现象。本文报道了在时变磁场作用下,磁囚禁$^{87}$ Rb玻色-爱因斯坦凝聚体(BEC)的晃动动力学的实验观察.我们观察到一个明显的相对位移之间的凝聚和热分数的质量中心。我们已经确定了这种相对的反相移动作为一个异相振荡模式,这是能够产生的凝聚/热馏分接口上的波纹。异相模式可以被包括作为一个可能的机制,涉及在涡旋成核和进一步的演变时,由随时间变化的磁场激发。
Reproducible nucleation and control of stable quantum vortex rings in Bose-Einstein condensates
Università degli Studi di Milano(米兰大学);Politecnico di Torino(都灵理工大学);Ulsan National Institute of Science and Technology (UNIST)(蔚山科学技术院);Istituto per le Applicazioni del Calcolo, Consiglio Nazionale delle Ricerche(意大利国家研究委员会计算应用研究所);Newcastle University(纽卡斯尔大学)
Bubble dynamics and vortex formation in holographic first-order superfluid phase transitions
Institute of Theoretical Physics, Chinese Academy of Sciences(中国科学院理论物理研究所);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院);Department of Physics, Technion(以色列理工学院物理系);School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences(中国科学院大学杭州高等研究院基础科学与数学学院)
Université Côte d’Azur(蔚蓝海岸大学);CNRS(法国国家科学研究中心);Institut de Physique de Nice (INPHYNI)(尼斯物理研究所);Laboratoire d’hydrodynamique, LadHyX, UMR 7646, CNRS & Ecole Polytechnique, IPParis(流体力学实验室、拉德海克斯实验室、CNRS与巴黎综合理工学院、IPParis);Pontifica Universidad Católica de Chile(智利天主教 Pontifica 大学)
Université Paris-Saclay(巴黎萨克雷大学);CNRS(法国国家科学研究中心);LPTMS(理论与数学物理实验室);Université Côte d’Azur(蔚蓝海岸大学);INPHYNI(光与物质相互作用研究所);Institut Universitaire de France (IUF)(法国高等研究院);Laboratoire Kastler Brossel(卡斯特尔-布罗塞尔实验室);Sorbonne Université(索邦大学);ENS-PSL Research University(巴黎文理研究大学);Collège de France(法兰西公学院)