【学术视频】“非厄米系统动力学演化及其拓扑性质”培训班 | 中国科大陈帅教授

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图 | 陈帅

题   目：Explore topology of quantum gases by quench dynamics

报告人：陈帅

单   位：中国科学技术大学

时   间：2019-12-14

地   点：北京计算科学研究中心

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报告摘要

The central role of quantum simulation via ultracold quantum gases is to synthesize an effective target Hamiltonian and studies the evolution or the phases of the atoms in such a system. The topological quantum matter and topological phase transition attracted many of the researchers in recent years. Here, we report the synthesis of the 2D Spin-Orbit coupled ultracold Bose gas by Raman coupling lattices. It is a "Quantum Anomalous Hall" model with topological non-trivial band structure. The topology of this system is explored by quench dynamics. By quench the Raman detuning, the band inversion surface (BIS) of the 2D topological system has been clearly observed from the time evolution of the spin-polarization pattern in the First Brillouin Zone. The topological phase boundary has been precisely determined. By quench the phase of the Raman coupling, we have further observed the topological charge in the system and obtain the winding of the spin on the BIS, which determined the Chern number of the system. Our work provides a simple and powerful tool to explore the topological properties. 

个人简介

陈帅，中国科学技术大学／中国科学院量子信息与量子技术创新研究院教授，入选中国科学院人才计划并获择优支持（2009年）。1997年7月毕业于吉林大学，获理学学士学位，2005年1月毕业于北京大学物理学院，获理学博士学位。2005年至2009年任德国海德堡大学博士后，2009年至今任中国科学技术大学教授。主要从事超冷原子物理量子模拟、量子光学和量子精密测量方面的研究。目前在科技部重点专项超冷原子的量子模拟项目中担任课题负责人。

会议简介

The International Workshop on Frontiers in Quantum Physics and Quantum Information is a series workshop for theoretical and experimental quantum information research. This year, we focus on the topic “topology and dynamics in non-Hermitian systems”. Non-Hermitian Hamiltonians were not taken seriously in the past since they were assumed to be unphysical. With the advent of parity-time reversal symmetric systems possessing real eigenvalues and conserved probability, and with numerous experimental demonstrations, such Hamiltonians are now studied routinely as many novel features in non-Hermitian systems may or may not have any analogue in the Hermitian counterparts. Study of topological phases in non-Hermitian systems is one of the fastest growing and hot research topics. Some of the models have no direct analogy with the Hermitian counterparts and predict exotic topological phases which remained elusive in Hermitian systems but can be rather easily obtained in non-Hermitian systems. The scientific objects of the workshop are to gather widely recognized experts in the field to present and discuss groundbreaking work.
主办方：北京计算科学研究中心

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