Topological condensate in an interaction-induced gauge potential
Topological condensate in an interaction-induced gauge potential
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相互作用引起的规范势中的拓扑凝聚
DOI：
10.1103/physreva.92.013604
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发表时间：
2014
影响因子：
2.9
通讯作者：
Da
中科院分区：
文献类型：
--
作者：
Jun Zheng;B. Xiong;G. Juzeliūnas;Da
本文系统地研究了多体效应和原子-光耦合作用下具有合成矢势的玻色-爱因斯坦凝聚体的基态和元激发。当原子间相互作用足够强时，我们发现凝聚体通过与矢势的自洽耦合发生Stoner型铁磁相变。在弱相互作用下，由于密度涨落对规范场的影响，超流的临界速度是各向异性的。我们进一步解析地证明了三维谐振势阱中的无核涡旋环和二维势阱中的无核涡旋-反涡旋对的拓扑基态。通过违反Kohn定理，可以在飞行时间实验或偶极振荡中测量循环持续电流。
We systematically investigate the ground state and elementary excitations of a Bose-Einstein Condensate with a synthetic vector potential, which is induced by the many-body effects and atom-light coupling. For a sufficiently strong inter-atom interaction, we find the condensate undergoes a Stoner-type ferromagnetic transition through the self-consistent coupling with the vector potential. For a weak interaction, the critical velocity of a supercurrent is found anisotropic due to the density fluctuations affecting the gauge field. We further analytically demonstrate the topological ground state with a coreless vortex ring in a 3D harmonic trap and a coreless vortex-antivortex pair in a 2D trap. The circulating persistent current is measurable in the time-of-flight experiment or in the dipolar oscillation through the violation of Kohn theorem.