题目：Recent Progress on Exploring Quantum Anomalous Hall Effect and Gate-Controlled Topological 1D Mode   

报告人：乔振华教授（中科大）

时间：2016年10月14日（周五）上午10:00

地点：三号楼221会议室

Abstract: In this talk, I will introduce the two parts of our recent work on two-dimensional topological phases. (1) The charge-compensated n-p codoping scheme is adopted to induce high-temperature quantum anomalous Hall effect in both magnetic topological insulators and graphene, with a sizable surface band gap and higher ferromagnetic Curie temperature. (2) The spin-flip disorder can lead to anomalous Anderson localization. (3) The spatially varying electric field can result in a valley-helical topologically confined 1D modes. Here, we report the first experimental realization of this mode in an AB-stacking bilayer graphene. We also show the transport properties of these topologically confined modes in the presence of disorders and magnetic field.   

References: 

[1] S. Qi, Z. Qiao, et al., PRL 117, 056804 (2016). 

[2] Z. Qiao, Yulei Han, et al., PRL 117, 056802 (2016).  

[3] J. Li, K. Wang, K. McFaul, Z. Zern, Y. F. Ren, K. Watanabe, T. Taniguchi, Z. Qiao, J. Zhu, Nature Nanotechnology, DOI: 10.1038/NNANO.2016.158 (2016). 

[4] Y. F. Ren, Z. H. Qiao, and Q. Niu, Rep. Prog. Phys. 79, 066501 (2016).