【预告】中科院物理所方辰研究员：Correspondence between spectral winding...
直播二维码
此次讲座由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、中科院强耦合量子材料重点实验室、中国科大物理系、科研部联合主办，由低温物理学报承办，于2020年11月19日15:00开始。授权蔻享学术进行网络直播。
主题：Correspondence between spectral winding and non-hermitian-skin effect
主讲人：方辰 研究员
单位：中国科学院物理研究所
主办方：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、中科院强耦合量子材料重点实验室、中国科大物理系、科研部
承办方：低温物理学报
报告摘要
I demonstrate a link between two phenomena in non-hermitian systems: the phase winding of the eigenvalue of the non-hermitian Hamiltonian on the complex plane under periodic-boundary condition, and the Non-hermitian-skin effect under open-boundary condition. The latter means the presence of an extensive number of localized modes, termed "skin modes", at the boundaries, an effect that is restricted to non-hermitian systems. This link is established as a theorem in 1D for one-band Hamiltonians, and as a conjecture in higher dimensions and in multi-band cases. Moreover, we develop an effective numerical method to solve for the open-boundary eigenvalues of any 1D non-hermitian Hamiltonian in the thermodynamic limit, by converting the problem into solving a set of algebraic equations.
References:
[1] K. Zhang, Z. Yang, and C. Fang*, Phys. Rev. Lett. 125, 126402 (2020)
[2] Z. Yang, K. Zhang, C. Fang* and J. Hu*, arXiv:1912.05499 (to appear in Phys. Rev. Lett.)
主讲人介绍
Chen Fang graduated from Purdue University with a PhD degree in physics in 2011. He worked as a postdoctoral research associate at Princeton University, University of Illinois, and Massachusetts Institute of Technology from 2011 to 2015. He joined the faculty of Institute of Physics, Chinese Academy of Sciences in 2015 as an associate professor, and was promoted to professor in 2018.Chen Fang has led his team to create, among other two international teams, the research field of high-order topological states in 2017. The same team in 2018 established the quantitative mappings between symmetry representations of bands and topological invariants, based on which he and Hongming Weng founded the Catalogue of Topological Electronic Materials in 2019. Since 2019, Chen Fang started to explore new research directions such as the bulk-edge correspondence in non-hermitian systems, and the quantum-many-body-scar dynamics.
编辑：王茹茹
海报：苏苗苗
往期系列讲座
“施汝为”系列讲座
系列讲座回放视频
为满足更多科研工作者的需求，蔻享平台开通了各科研领域的微信交流群。进群请添加微信18019902656（备注您的科研方向）小编拉您入群哟！
欢迎大家提供各类学术会议或学术报告信息，以便广大科研人员参与交流学习。
联系人：李盼 18005575053（微信同号）
欢迎大家提供各类学术会议或学术报告信息，以便广大科研人员参与交流学习。