| 报告题目 | Theory of quantum anomalous Hall effect in graphene and its potential realization |
| 报告人 | Dr. Zhenhua Qiao |
| 报告人单位 | The University of Texas at Austin, USA |
| 报告时间 | 2013-04-23 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | Abstract：
In this talk, I will introduce our progress on engineering quantum anomalous Hall effect (QAHE) in graphene systems. Graphene itself is a nonmagnetic material. Through external means (doping 3d metal atoms, or using a substrate), graphene can become magnetized and its spin-orbit coupling can be greatly enhanced. We show that the synergy between Zeeman field and Rashba spin-orbit coupling can open a nontrivial bulk gap supporting a QAHE [1]. We give a microscopic theory to understand its physical formation mechanism [2,3]. We further provide some evidence for the possible realization in experiment [4,5]. Some interesting topological phases (tunable QAHE, tunable quantum valley Hall effect, and 2D TI) in gated bilayer graphene will also be introduced [2,6,7].
References:
[1] Z. H. Qiao et al., Phys. Rev. B 82, 161414(R) (2010);
[2] W.-K. Tse et al., Phys. Rev. B 83, 155447 (2011);
[3] Z. H. Qiao et al., Phys. Rev. B 85, 115439 (2012);
[4] J. Ding et al., Phys. Rev. B 84, 195444 (2011);
[5] H. Jiang et al., Phys. Rev. Lett. 109, 116803 (2012);
[6] Z. H. Qiao et al., Phys. Rev. Lett. 107, 256801 (2011);
[7] Z. H. Qiao et al., Phys. Rev. B 87, 125405 (2013).
Biosketch:
Dr. Zhenhua Qiao received his B.S. degree from Shanxi University in 2005, and obtained his Ph.D. in Condensed Matter Theory and Computational Physics at the University of Hong Kong in 2009. Until now he is a postdoc fellow in the University of Texas at Austin. He has published 22 papers, including 5 Phys. Rev. Lett., 2 Nano Letters, 12 Phys. Rev. B (3 Rapid Communications). His main research interests include mesoscopic electronic transport in low-dimensional systems, topological states in graphene systems, spin-Hall effect, topological Insulators, quantum Hall effect, and anomalous Hall effect, etc. Dr. Qiao is a recipient of 2008 Young Scientist Award from Hong Kong Institute of Science. He will join USTC full-time as a "Bairen" Professor this summer. |
