【学术视频】第九届量子能源国际研讨会 | 美国犹他大学刘锋教授

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题   目：Excited quantum Hall effect: enantiomorphic flat bands in a Yin-Yang kagome lattice报告人：刘锋单   位：University of Utah时   间：2019-10-21地   点：厦门

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报告摘要

Quantum Hall effect (QHE) is one of the most fruitful research topics in condensed-matter physics. Ordinarily, the QHE manifests in a ground state with time-reversal symmetry broken by magnetization to carry a quantized chiral edge conductivity around a two-dimensional insulating bulk. We propose a theoretical concept and model of non-equilibrium excited-state QHE (EQHE) without intrinsic magnetization. It arises from circularly polarized photoexcitation between two enantiomorphic flat bands of opposite chirality, each supporting originally a helical topological insulating state hosted in a Yin-Yang Kagome lattice. The chirality of its edge state can be reversed by the handedness of light, instead of the direction of magnetization as in the conventional quantum (anomalous) Hall effect, offering a simple switching mechanism for quantum devices. Implications and realization of EQHE in real materials are discussed.

个人简介

Feng Liu, Professor of Department of Materials Science and Engineering, Adjunct professor, Department of Physics, University of Utah. He received his PhD in Chemical Physics from Virginia Commonwealth University in 1990. Prof. Liu is a fellow of American Physical Society and recipient of Senior Humboldt Award. His research interest lies in theoretical and computational studies of low-dimensional nano and quantum materials, with a most recent focus on topological materials. He is also a co-founder of two high-tech start-up companies.

会议简介

由中国科学技术大学合肥微尺度物质科学国家研究中心国际功能材料量子设计中心（ICQD）和复旦大学主办、厦门大学承办的第九届量子能源国际研讨会，于2019年10月21日至23日在福建厦门召开。量子能源研讨会已成功地举办了八届，其初衷是邀请已有的和每年新增加的国家自然基金委员会能源领域重点项目团队，以解决能源问题为目标，围绕“量子能源”领域的重大科学问题，结合最前沿的理论与实验研究进展，进行深入的学术交流与讨论。随着中国科学技术大学“新型能源材料的量子设计创新引智基地”（简称“111计划”）的获批，从第四届开始会议扩大了规模，也包括“111计划”的海内外成员。

—— ——往期精彩回顾—— ——● 美国犹他大学材料物理学家刘锋教授与他的音乐故事●【学术视频】刘锋--University of Utah: Fermionic Analogue of Black Hole with a Super High Hawking Temperature●【学术视频】ICFSI-17 | 中科院物理研究所杜世萱研究员：Electronic-Structure Engineering of Graphene by Semiconductor Intercalation●【学术视频】第二届ICQD青年科学家论坛 | 上海大学任伟教授：二维材料的电子结构计算和物性调控●【学术视频】2019微纳科技与产业国际论坛 | 欧洲科学院李保文院士：热二级管/晶体管和热超材料：热能调控的艺术●【学术视频】机器学习-计算化学Workshop | 复旦大学刘智攀教授：Global optimization based Neural Network Potential and Reaction Prediction Artificial Intelligence●【学术视频】第一届量子算法与软件国际研讨会 | 中科院计算技术研究所孙晓明研究员：Optimal Space-Depth Trade-Off of CNOT Circuits●【学术视频】第13届全国分子束外延学术会议 | 清华大学郝智彪教授：氮化物纳米线量子点分子束外延与特性研究

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