Ground-State Phase Diagram of a Spin-Orbital-Angular-Momentum Coupled Bose-Einstein Condensate
Ground-State Phase Diagram of a Spin-Orbital-Angular-Momentum Coupled Bose-Einstein Condensate
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自旋轨道角动量耦合玻色爱因斯坦凝聚体的基态相图
DOI：
10.1103/physrevlett.122.110402
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发表时间：
2019
影响因子：
8.6
通讯作者：
Jiang Kaijun
中科院分区：
文献类型：
--
作者：
Zhang Dongfang;Gao Tianyou;Zou Peng;Kong Lingran;Li Ruizong;Shen Xing;Chen Xiao Long;Peng Shi Guo;Zhan Mingsheng;Pu Han;Jiang Kaijun
通过使用一对高斯和拉盖尔-高斯激光束诱导拉曼跃迁，我们实现了轨道角动量（OAM）与其内部自旋态耦合的凝聚态。通过改变拉曼跃迁的失谐和耦合强度，我们首次通过实验绘制出了系统的基态相图。不同相之间的转变具有 OAM 和自旋极化的不连续跳跃，因此是一阶的。我们演示了与此类一阶相变相关的磁滞回线。原子间相互作用的作用也得到了阐明。我们的工作为探索自旋轨道角动量耦合量子气体中的奇异量子相铺平了道路。
By inducing a Raman transition using a pair of Gaussian and Laguerre-Gaussian laser beams, we realize acondensate whose orbital angular momentum (OAM) and its internal spin states are coupled. By varying the detuning and the coupling strength of the Raman transition, we experimentally map out the ground-state phase diagram of the system for the first time. The transitions between different phases feature a discontinuous jump of the OAM and the spin polarization, and hence are of first order. We demonstrate the hysteresis loop associated with such first-order phase transitions. The role of interatomic interaction is also elucidated. Our work paves the way to explore exotic quantum phases in the spin-orbital-angular-momentum coupled quantum gases.