Correlated Chern insulator in two-dimensional materials
Theoretical Division, Los Alamos National Laboratory
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.
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 .
 Y. Su, H. Q. Li, C. W. Zhang, K. Sun, and S.-Z. Lin, arXiv:2110.02537
 T. Li, et al., Nature 600, 641 (2021).
 H. Q. Li, U. Kumar, K. Sun, S.-Z. Lin, Phys. Rev. Research 3, 032070 (2021)
邀请人：张 颖（8264 9868）