Topological phonons Based on First principle...

报告题目:Topological phonons Based on First principles calculations and symmetry arguments

报告人:王锐教授  重庆大学物理学院

报告时间:2022年12月 16 日下午16:00-17:00

报告地点:腾讯会议 229-764-883

报告摘要:Condensed-matter systems have provided fascinating avenues for the discovery of fermions as quasiparticle excitations in realistic materials, such as Majorana excitations in topological superconductors and Dirac or Weyl excitations in topological semimetals. Beyond nontrivial fermionic excitations, other elementary excitations such as topological bosons have been intensively studied. Here, we mainly report our recent works on the symmetry-enforced topological phonons based on symmetry arguments and first-principles calculations: 1. symmetry-protected topological triangular Weyl complex; 2. hourglass phonons jointly protected by symmorphic and nonsymmorphic symmetries; 3. three-dimensional Dirac phonons with inversion symmetry. These works not only offer different insights into the hourglass dispersion, but also expands aspects for studying promising topological quasiparticles in condensed-matter systems.

References:

Phys. Rev. Lett. 123, 065501 (2019)

Phys. Rev. Lett. 124, 105303 (2020)

Phys. Rev. B 104, L060301 (2021)

Phys. Rev. Lett. 126, 185301 (2021)

arXiv: 2210.14592 (2022)

报告人简介:王锐,重庆大学物理学院教授,博士生导师,国家自然基金委优秀青年基金获得者(2022年),入选重庆青年拔尖人才。2003年至2012年在重庆大学学习,获得学士、硕士、博士学位。2012年博士毕业留校任教,历任讲师、副教授、教授。2017-2018年曾在南方科技大学作访问学者研究。长期从事计算凝聚态物理研究,通过理论建模与数值计算,并结合对称性分析、紧束缚模型等方法,围绕拓扑电子材料、拓扑声子材料的理论设计与外场调控等科学问题开展了一些研究工作,相关研究成果已经在Phys. Rev. Lett.、Phys. Rev. B、Nano Letters等期刊发表论文40余篇, 主持国家自然基金项目4项。

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