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3D Quantum Hall effect
来源: 日期2018-09-26 14:43 点击:

 报告题目:3D Quantum Hall effect

报 告 人:卢海舟 luhaizhou@gmail.com

报告时间:2018年9月30号上午10点10分

报告地点:仲英楼B835室

Abstract:

The discoveries of the quantum Hall effect have led to three Nobel prizes and the booming field of topological states of quantum matter. So far,the quantum Hall effect is observed only in 2D systems. We show that the Fermi arcs can give rise to a distinctive quantum Hall effect in topological semimetals in three dimensions [1].Topological semimetals are 3D topological states of matter, in which the energy bands touch at a finite number of Weyl nodes. They host topologically-protected surface states, known as the Fermi arcs.Via a “wormhole” tunnelling assisted by the Weyl nodes, the Fermi arcs at two opposite surfaces can form a single 2D electron gas and support a quantum Hall effect in three dimensions. Possible signatures of the 3D quantum Hall effect have been observed in several experiments on the topological Dirac semimetal Cd3As2 [2-4]. Our discoveryof this 3D quantum Hall give an example of (d-2)-dimensional boundary states, a promising direction in topological states of quantum matter.

References:

[1] C. M. Wang, Hai-Peng Sun, Hai-Zhou Lu*, and X. C. Xie, Phys. Rev. Lett. 119, 136806 (2017).

[2] C. Zhang, F. X. Xiu, et al., Nature Comm. 8, 1272 (2017).

[3] Uchida, et al., Nature Comm. 8, 2274 (2017).

[4] Schumann, Stemmer, et al., Phys. Rev. Lett. 120, 016801 (2018).

About speaker:

Haizhou Lu obtained his Ph.D. in Physics from Tsinghua University, Beijing, in 2007. From 2007 to 2015, he was a postdoc and then research assistant professor at the University of Hong Kong. He is now a professor of physics at Southern University of Science and Technology at Shenzhen. His research is on the quantum transport in topological states of matter. He has published over 60 articles in physics journals, including 12 in PRL, 1 in Nature Physics, and 4 in Nature Communications, with a citation over 2700 and h-index of 26.

 
 
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