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Quantum Magnetoconductivity of Topological Semimetals in High Magnetic Fields

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报告题目   Quantum Magnetoconductivity of Topological Semimetals in High Magnetic Fields
报告人   Prof. SHEN Shunqing (沈顺清)
报告人单位   Department of Physics,The University of Hong Kong
报告时间   2015-05-29
报告地点   合肥微尺度物质科学国家实验室（9004室）
主办单位   合肥微尺度物质科学国家实验室、国际功能材料量子设计中心
报告介绍
Abstract：
Weyl semimetals are three-dimensional topological states of matter, in a sense that they host paired monopole and anti-monopole of Berry curvature in momentum space, leading to the chiral anomaly. Here, we study the quantum magnetoconductivity of Weyl and Dirac semimetals in the diffusive regime. In the presence of a strong magnetic field along the direction connecting two Weyl nodes, it is found that the conductivity along the field is determined by the Fermi velocity. The conductivity is independent of the magnetic field in the undoped case that the Fermi level crosses the Weyl nodes. The magnetoconductivity is negative in the electron-doped regime while it is positive in the hole-doped regime. Meanwhile the conductivity normal to the field is negligibly weak, and its magnetoconductivity is positive. The high anisotropy of the magnetoconductivity is attributed to the chiral anomaly in the transport of Weyl semimetals. The magnetoconductivity of Dirac semimetals is always negative in strong fields.
 
Reference
H. Z. Lu, S. B. Zhang & S. Q. Shen, “Quantum Magnetoconductivity of Topological Semimetals in High Magnetic Fields”, arXiv: 1503.04394.
H. Z. Lu & S. Q. Shen, “Tendency to Localization in Interacting Weyl Semimetals”, arXiv: 1411.2686..

Biosketch：
　　Professor Shun-Qing Shen, an expert in the field of condensed matter physics, is distinguished for his research works on topological insulator, spintronics of semiconductors, quantum magnetism and orbital physics in transition metal oxides, and novel quantum states of condensed matters. He received his BS, MS, and PhD in theoretical physics from Fudan University in Shanghai. He was a postdoctoral fellow (1992 – 1995) in China Center of Advanced Science and Technology (CCAST), Beijing, Alexander von Humboldt fellow (1995 – 1997) in Max Planck Institute for Physics of Complex Systems, Dresden, Germany, and JSPS research fellow (1997) in Tokyo Institute of Technology, Japan. Shen joined Department of Physics, The University of Hong Kong in December 1997, and became a professor of physics in July 2007. He was awarded Croucher Senior Research Fellowship (Croucher Prize) in 2010.

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