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| Topological phenomena in periodically driven quantum materials |
| 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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