题目:3D Quantum Hall effect
报告人:卢海舟 副教授
南方科技大学物理系
时间:2018年6月22日上午10:00
地点:国家脉冲强磁场科学中心C204
报告摘要:
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 discovery of this 3D quantum Hall give an example of (d-2)-dimensional boundary states, a promising direction in topological states of quantum matter.
参考文献:
[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).
报告人简介:
卢海舟,2007年获清华大学物理学博士学位,2007年至2015年在香港大学从事博士后研究并转为研究助理教授,现为南方科技大学物理系副教授。目前主要从事凝聚态物理的研究,特别是量子输运,已在物理学期刊发表论文60余篇,包括11篇PRL、1篇Nature Physics、3篇Nature Communications,总引用2500多次,H指数25。
热忱欢迎广大老师,同学来聆听报告!