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Non-Equilibrium Topological Insulators with Ultracold Atoms
来源: 日期2018-07-08 20:44 点击:

报告题目:Non-Equilibrium Topological Insulators with Ultracold Atoms

:胡颖 教授 (山西大学)

报告时间:7月9号(下周一)下午4:30

报告地点:仲英楼B253会议室

报告摘要

There are presently ongoing experiments aimed at observing quantum Hall physics with ultracold gases. At zero temperature, the direct correspondence between the Chern number of the ground state, the Hall conductance, and the chiral edge statesiswell established. Yet, non-equilibrium scenarios generically occur in cold-atom experiments, where starting from a topologically trivial initial state, the Hamiltonian is parametrically driven into a topological regime. However, the system can never enter a Chern insulatorstateunder such coherent evolution, thus raising the challenge as to which manifestations of topology can be actually observed in cold atom setups. Addressing this experiment relevant issue, we show that thenon-equilibriumHall response can be quantized despite the non-topological nature of the state at all times [1].I will proceed to discuss how Floquet driving can be harnessed to transcend fundamental constraints in equilibrium systems. Specifically, I show that the perfect spin momentum locking, which in equilibrium only occurs in 2D topological insulators, can emerge in 1D Floquetlatticesystemsnon-adiabatically[2].

References:

[1].Ying Hu, Peter Zoller, Jan Carl Budich,Dynamical Buildup of a Quantized Hall Response from Non-Topological States,Phys. Rev. Lett. 117, 126803 (2016)

[2]. Jan Carl Budich,Ying Hu, Peter Zoller,Helical Floquet Channels in 1D Lattices,Phys.Rev. Lett. 118.105302 (2017)

报告人简介:

胡颖于美国范德堡大学获得物理学博士学位。曾在北京大学量子材料中心、奥地利因斯布鲁克量子光学与量子信息研究所从事与超冷原子相关的博士后研究工作。2017年成为山西大学量子光学与光量子器件国家重点实验室教授,并入选国家青年千人。目前其研究集中在AMO物理、拓扑态、非平衡多体量子系统等的交叉领域。

 
 
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责任编辑:马瑞峰
 
 
 
 
 
 
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