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Topological phenomena in periodically driven quantum materials
2017-09-25  【 】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Lunch Seminar

Title

题目

Topological phenomena in periodically driven quantum materials

Speaker

报告人

汪忠 研究员

Affiliation

所在单位

清华高研院

Date

日期

2017年9月25日(周一)中午12:00

Venue

地点

Conference Hall 322, ITP/理论物理所322报告厅

 

Abstract

摘要

Recently, periodically driven quantum systems (Floquet systems) are under active investigations. Periodic drivings such as light-matter interactions are useful in engineering and controlling various topological states, and even more remarkably, they are able to create novel topological states without static counterpart. In this talk, I will give a brief introduction to topological aspects of periodically driven systems. I will then talk about our recent works on driving-induced transitions from topological nodal-line semimetals to Weyl and multi-Weyl semimetals. I will also introduce a general formulation of topological invariants of Floquet systems, which is useful in numerical study and topological classifications of Floquet systems.
Refs: [1] arXiv:1708.05993;
[2] PRB 96, 041206 (2017);
[3] PRL 117, 087402 (2016)

Contact Person

所内联系人

周森
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