4月19日 北京大学王健研究员学术报告：Quantum Griffiths singularity in 2D superconductors and potential topological superconductivity

题目：  Quantum Griffiths singularity in 2D superconductors and potential topological superconductivity   in topological materials  

报告人：       Prof. Jian Wang          

                      International Center for Quantum Materials, School of Physics, Peking University  

报告时间：  2016年4月19日（周二） 14:30  

报告地点：  唐仲英楼A313  

Abstract：  
By both in situ scanning tunneling microscopy/spectroscopy and ex situ transport and magnetization measurements, we find that the two-atomic-layer Ga film with graphene-like structure on wide band-gap semiconductor GaN is superconducting with Tc up to 5.4 K. [1] Furthermore, in three-atomic-layer Ga films, we firstly observe quantum Griffiths singularity in two dimensional (2D) system and superconductors.[2] As for the superconductivity in topological materials, we detect the novel superconductivity on the surface of crystalline 3D Dirac semimetal Cd3As2 [3] by using hard point contact measurements with some signatures showing the possibility of topological superconductivity.[4]  

References:  

1. Physical Review Letters 114, 107003 (2015) (Editors’ Suggestion)  

2. Science 350, 542 (2015) (with a perspective article: Science 350, 509)  

3.  Physical Review X 5, 031037 (2015)  

4. Nature Materials 15, 38 (2016)