Shizeng Lin | Correlated Chern insulator in two-dimensional materials

<注:本视频仅用于学术交流,版权归报告人所有>

 

►【“凝聚态物理-中关村论坛”第399次讲座】

题目:Correlated Chern insulator in two-dimensional materials

时间:2022年7月13日(星期三)上午10:30

报告人:Shizeng Lin, Theoretical Division, Los Alamos National Laboratory

地点:线上

报告摘要:

Chern insulator is a special type of insulator with a robust chiral edge model as a consequence of its nontrivial topology. Chern insulators have many important applications ranging from quantum metrology and topological quantum computation. However, experimental realization of the Chern insulator remains a challenge, and only a few materials are known to host the Chern insulating state. In this talk, I will present a new generic routine to achieve the Chern insulators by placing a massive Dirac fermion in a periodic potential. The band folding due to the periodic potential causes hybridization of the Dirac spectrum and stabilizes a Chern band. I will discuss the applications of our theory to two-dimensional transition metal dichalcogenide heterostructures. Finally, I will discuss the realization of the fractional Chern insulating state in the limit of strong Coulomb interaction .


[1] Y. Su, H. Q. Li, C. W. Zhang, K. Sun, and S.-Z. Lin, arXiv:2110.02537

[2] T. Li, et al., Nature 600, 641 (2021).

[3] H. Q. Li, U. Kumar, K. Sun, S.-Z. Lin, Phys. Rev. Research 3, 032070 (2021)

报告人简介

Dr. Shi-Zeng Lin received his PhD in physics from the University of Tsukuba and National Institute for Materials Science, Japan in 2010. Lin came to Los Alamos National Laboratory as a postdoctoral researcher in 2011 and became a Staff Scientist in 2014. Lin is a condensed matter theorist. His current research interests include magnetic skyrmions, topological and correlated states in two dimensional materials and heavy fermion materials. Lin has published about 100 papers including 17 Phys. Rev. Lett., 1 Phys. Rev. X, 4 Nature Physics/Electronics/Communications and 3 invited review articles.