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物理学院“博约学术论坛”系列报告第42期

发布日期:2013年11月01日

题 目:Transport Properties of Topologically-Protected 1D Zero-Line Mode

报告人:乔振华 教授 (中国科学技术大学物理系)

时 间:2013年11月4日(星期一)上午10:00 

地 点:中心教学楼610

ABSTRACT 

When the inversion symmetry of graphene systems is broken, e.g. graphene subjected to a staggered sublattice potential or bilayer under an applied interlayer potential difference, a bulk band gap opens to support the quantum valley-Hall state. When the potential varies spatially, a topological one-dimensional conducting channel is formed along the zero-line of the potential. We find that such a state shows the property of zero bend resistance. And if two straight zero lines crosses, we show that the splitting of the zero line mode obeys a counterintuitive current partition law. We provide a simple theory to explain these novel characteristics.  

Curriculum Vitae:

EDUCATION 

09/2009– 08/2013 The University of Texas at Austin, Austin, Texas, USA Postdoctoral Fellow in Prof. Qian Niu’s group 

09/2005– 06/2009 The University of Hong Kong, Hong Kong Ph.D in Condensed Matter Theory and Computational Physics Advisor: Prof. Jian Wang 

09/2001– 07/2005 Shanxi University, Taiyuan, P. R. China B.Sc. in Physics (National Science Talent Training Base)

WORK EXPERIENCE

09/2013 – Current: Professor in Department of Physics, University of Science and Technology of China, China.

09/2009 – 08/2013: Postdoc in Department of Physics, the University of Texas at Austin, Austin, Texas, USA.

06/2009 – 08/2009: Research Assistant in Department of Physics, the University of Hong Kong, Hong Kong.

09/2005 – 06/2009: Teaching Assistant in Department of Physics, the University of Hong Kong, Hong Kong.

RESEACH INTERESTS ?

Mesoscopic electronic transport in low-dimensional systems; ?

Spin-Hall effect, topological Insulators, quantum Hall effect, and anomalous Hall effect; ?

Topological states in graphene systems, transport properties of single layer and bilayer graphene; ?

First-principles calculations (VASP+NADCAL); 

Mail Publications

1. “Engineering topological phases in graphene systems” (Invited review article) Zhenhua Qiao and Qian Niu To appear in Rep. Prog. Phys. [Impact Factor: 13.232]

2. “Quantum anomalous Hall effect in graphene” (Invited review article) Zhenhua Qiao and Qian Niu To appear in J. Phys.: Condens. Matter [Impact Factor: 2.332]

3. “Stabilizing topological phases in graphene via random adsorption” Hua Jiang, Zhenhua Qiao*, Haiwen Liu, Junren Shi, and Qian Niu (*correspondence author) Physical Review Letters 109, 116803 (2012) [Impact Factor: 7.943]

4. “Unbalanced edge modes and topological phase transition in gated trilayer graphene”, Xiao Li, Zhenhua Qiao*, Jeil Jung, and Qian Niu Physical Review B (Rapid Communication) 85, 201404 (2012) [Impact Factor: 3.767] Selected to: Virtual Journal of Nanoscale Science & Technology, Vol 25, Iss 22 (2012)

5. “Transport Properties of Graphene Nanoroads in Boron Nitride Sheets” Jeil Jung, Zhenhua Qiao*, Qian Niu, and Allan H. MacDonald (*correspondence author) Nano Letters 12, 2936 (2012) [Impact Factor: 13.025]

6. “Microscopic theory of quantum anomalous Hall effect in graphene” Zhenhua Qiao, Hua Jiang, Xiao Li, Yugui Yao, and Qian Niu Physical Review B 85, 115439 (2012) [Impact Factor: 3.767]

7. “Two-dimensional topological insulator state and topological phase transition in bilayer graphene” Zhenhua Qiao, Wang-Kong Tse, Hua Jiang, Yugui Yao, and Qian Niu Physical Review Letters 107, 256801 (2011) [Impact Factor: 7.943]

8. “Electronic highways in bilayer graphene” Zhenhua Qiao, Jeil Jung, Qian Niu, and Allan H. MacDonald Nano Letters, 11(8), 3453 (2011) [Impact Factor: 13.025]

9. “Quantum anomalous Hall effect in graphene from Rashba and exchange effects” Zhenhua Qiao, Shengyuan Yang, Wanxiang Feng, Wang-Kong Tse, Jun Ding, Yugui Yao, Jian Wang, and Qian Niu Physical Review B (Rapid Communication) 82, 161414 (2010) [Impact Factor: 3.767]

10. “Theoretical investigation of how edge states are destroyed in disordered mesoscopic samples” Zhenhua Qiao, Jian Wang, Qingfeng Sun, and Hong Guo Physical Review B 79, 205308 (2009) [Impact Factor: 3.767]

11. “Universal quantized spin-Hall conductance fluctuation in graphene” Zhenhua Qiao, Jian Wang, Yadong Wei, and Hong Guo Physical Review Letters 101, 016804 (2008) [Impact Factor: 7.943]

12. “Low field phase diagram of spin-Hall effect in the mesoscopic regime” Zhenhua Qiao, Wei Ren, Jian Wang, and Hong Guo Physical Review Letters 98, 196402 (2007) [Impact Factor: 7.943] 

邀 请 人:姚裕贵 教授

联系方式:物理学院办公室 (68913163)

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