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10-25 物理学科Seminar第440讲:Staggered fluxes for Bose Hubbard model in two-leg ladder configuration

创建日期 2018/10/18 永乐   浏览次数  55   返回    
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物理学科Seminar440

报告题目(TitleStaggered fluxes for Bose Hubbard model in two-leg ladder configuration
报 告 人(Speaker):Friederike Metz研究生(日本冲绳科学技术研究所)
报告时间(Time20181025 日(周四) 上午 830
报告地点(Place:校本部G309
邀请人(inviter陈玺、 张永平
报告摘要(Abstract

Ultracold bosons in two-legged latter systems are a fundamental model to understand the physics of larger systems. Here I will present our work on the ground state properties of such a system under the influence of an artificial staggered magnetic flux. I will show how to calculate the order parameters of the arising superfluid phases and find the full phase diagram, which is obtained analytically through the Landau theory of phase transitions and numerically through a Cluster-mean-field theory. Finally, I will show that the experimental signatures of the superfluids is given by the chiral currents.

物理学科Seminar441

报告题目(TitleQuench dynamics of two-particle systems with synthetic spin-orbit coupling
报 告 人(Speaker):Ayaka Usui 研究生(日本冲绳科学技术研究所)
报告时间(Time20181025 日 (周四) 上午 930
报告地点(Place:校本部G309
邀请人(inviter陈玺、 张永平
报告摘要(Abstract

Spin-orbit coupling in ultra cold gases allows to examine this phenomenon in highly configurable situations. Just ask 张永平教授 how cool it is. Here we will present work that considers two interacting bosons with synthetic spin-orbit coupling in one dimension. The two bosons are described by two identical atoms with different hyperfine states, and can therefore be regarded as a two-level system with a pseudo-spin. The system is tractable since it is solvable exactly for some sets of parameters and allows to study what happens without any approximations. Here we will discuss the static properties of the system such as the ground state and the energy spectrum and also present results describing quench dynamics when a single parameter suddenly changed. Our particular interest are the non-classical properties that this system displays.

 


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