7003全讯入口“博约学术论坛”系列报告
第 92 期     ( 2016年第 21期)

Title：Topological superconductivity in Sb(111) thin films close to Van Hove singularities
报告人：Wei-Feng Tsai (中山大学)
时  间：2016年12月2日(周四)上午10:00
地  点：7003全讯入口中心教学楼610
ABSTRACT
We theoretically investigate the development of unconventional superconductivity in the Sb(111) thin film when its Fermi level is tuned to near type-II Van Hove singularities (VHS), which locate at non-time-reversal invariant momenta. Via patch renormalization group analysis, we show that the leading instability is a topological p+ip-wave superconducting order. The origin of such pairing relies on the hexagonal structure of the VHS and strong spin-orbit coupling, resulting in the anisotropy of the electron-electron scattering to provide an attractive channel. Our study hence suggests that superconducting Sb thin films originated from VHS physics may host Majorana zero modes in the magnetic vortices and provides another application perspective to such material. In this talk, some other related materials within the same scenario will also be briefly discussed.
Ref.  J.-Q. Huang, C.-H. Hsu, H. Lin, D.-X. Yao, and W.-F. Tsai, Phys. Rev. B 93, 155108 (2016).

Curriculum Vitae
Wei-Feng Tsai,
Professor, School of Physics, Sun Yat-sen University, Guangzhou, China.

Education:
University of California, Los Angeles, California USA, Ph.D., Physics, August 2008,
Taiwan University, Taiwan, M.S., Physics, June, 2002; B.S., Physics, June, 1998.

Research Interests:
Strongly correlated electron systems, unconventional superconductivity, topological insulators (superconductors), phase transition and quantum information, and spin/charge transport in nanoscale structures.

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