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A stripe phase with supersolid properties in spin-orbit coupled Bose-Einstein condensates
来源: 日期2017-12-07 21:38 点击:

报告题目:A stripe phase with supersolid properties in spin-orbit coupled Bose-Einstein condensates

报 告 人:李俊儒

Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, MIT

报告时间:本周五下午(2017年12月8日)下午16:00-18:00

报告地点:基础学科大楼B253

报告摘要:

Supersolidity combines superfluid flow with long-range spatial periodicity of solids, two properties that are often mutually exclusive. The original discussion of quantum crystals and supersolidity focused on solid 4He and triggered extensive experimental efforts. The concept of supersolidity was then generalized from quantum crystals to other superfluid systems that break continuous translational symmetry. Bose-Einstein condensates with spin-orbit coupling are predicted to possess a stripe phase which carries such supersolid properties.

I will talk about our recent work on realizing spin-orbit coupling with ultracold atoms and the associated stripe phase in an optical superlattice.

We proposed a new scheme for realizing the spin-orbit coupling in an optical superlattice where the orbital degree of freedom is used as the pseudospin. We demonstrated the feasibility of such scheme and observed the predicted density modulation of this stripe phase using Bragg reflection (which provides evidence for spontaneous long-range order in one direction) while maintaining a sharp momentum distribution (the hallmark of superfluid Bose-Einstein condensates). Our work thus establishes a system with supersolid properties, namely, continuous symmetry-breaking properties and superfluid behaviour.

报告人简历:

2012年本科毕业于清华大学物理系;2012至今在MIT师从诺贝尔物理学奖获得者Wolfgang Ketterle教授组攻读博士学位,主要方向Quantum Simulation,2017年以第一作者在Nature发表论文“A stripe phase with supersolid properties in spin–orbit-coupled Bose–Einstein condensates”(Nature 543(2017)91)。Wolfgang Ketterle教授因在碱性原子稀薄气体的玻色-爱因斯坦凝聚方面取得的成就,以及凝聚态物质属性质的早期基础性研究获得2001年诺贝尔物理学奖。

 
 
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