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“凝聚态物理-中关村论坛”第 361 次讲座
 
题目: Phase transition in a spin-orbital-angular-momentum coupled Bose-Einstein condensate
时间: 2019年04月26日 10:00
地点: 中科院物理研究所M楼253会议室
报告人: 江开军 研究员

中国科学院武汉物理与数学研究所

报告人简介:

江开军,中国科学院武汉物理与数学研究所研究员,博士生导师,2010年入选中科院“百人计划”。1994~1998,武汉大学获学士学位;1999~2005,中科院武汉物理与数学研究所(WIPM)获博士学位;2005~2008,美国国家标准与技术研究院(NIST)从事博士后研究;2008~2010,法国巴黎高等师范学院(ENS)从事博士后研究;2010~至今,中科院武汉物理与数学研究所任研究员。从事超冷原子物理研究,发表SCI论文30余篇,包括1篇Nature和5篇PRL等。现主要研究方向:简并费米气体中的少体和多体相互作用;具有球对称玻色凝聚体的集体行为和自旋-轨道角动量耦合玻色气体的新奇量子态。

报告摘要:

Coupling between particle's spin and orbital motion is ubiquitous in atoms, photons, solid materials and many other systems. It contributes to the topological properties like quantum-Hall effect in solid materials and electronic fine structure in atoms. Ultracold atoms with a high tunability provides an ideal platform to study spin-orbit (SO) coupling. Spin-linear-momentum (SLM) coupling has been observed in quantum gases and subsequently a variety of exotic quantum states have been explored. While the experimental study on the other kind of SO coupling, namely the spin-orbital-angular-momentum (SOAM) coupling, is still lacking.

In this talk, I will report the experimental observation of the ground-state phase diagram of the SOAM coupled Bose-Einstein condensate. By inducing a Raman transition using a pair of Gaussian and Laguerre-Gaussian (LG) laser beams, we realize SOAM coupling of ultracold atoms. We observe phase transitions when the two-photon Raman coupling strength or detuning approaches the critical value. The phase transitions are classified as the first order, which feature a discontinuous jump of the angular momentum (OAM) and the spin polarization. We demonstrate the hysteresis loop across the first-order phase transition. The role of interatomic interaction on the phase transition is also elucidated.

邀 请 人:刘伍明(电话:8264 9249)

联 系 人:李园园(电话:8264 9364)


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