报告题目: Microscopic theory of in-plane critical field  in two-dimensional Ising superconducting systems

报告人: 刘海文 教授 （北京师范大学物理系高等量子研究中心）

报告时间：2022年3月18日（星期五）15：30 - 17：00

报告地点：腾讯会议（会议ID：851 776 914）

Abstract:

In this talk, I will show our theoretical attempts to study the in-plane critical magnetic field of two-dimensional Ising superconducting systems, and to propose the microscopic theory for these systems with or without inversion symmetry[1]. Protected by certain specific spin-orbital interaction which polarizes the electron spin to the out-of-plane direction, the in-plane critical fields largely surpass the Pauli limit and show remarkable up-turn in the zero temperature limit. The impurity scattering and Rashba spin orbital scattering, treated on equal-footing in the microscopic framework, both weaken the critical field but in qualitatively different manners. The microscopic theory is consistent with recent experimental results in Pb[2,3] and stanine[4] superconducting ultra-thin films. I will also briefly mention my recent research on the transport property of two-dimensional disordered superconductor with Ohmic dissipation [5].

报告人简介:

2006年毕业于北京大学，获得物理学、应用数学双学士学位。2012于中国科学院物理所获得博士学位。2012-2015年在北京大学量子材料科学中心进行博士后研究，并担任助理研究员。2016年入职北京师范大学物理系高等量子研究中心，先后担任青年研究员，教授。刘老师主要研究低维体系中杂质、退相干效应对量子输运性质的影响。主持自然科学基金优秀青年基金项目、面上项目、青年项目各1项，并作为骨干成员参与科技部重点研发计划2项。发表论文60余篇，包括Nature，Science，Physical Review Letters等。

Haiwen Liu has obtained his bachelor degree from the school of Physics, PKU in 2006, and doctor degree from the Institute of Physics, CAS in 2012. During 2012 to 2015, he is a postdoctoral researcher at ICQM, PKU. Since 2016, he is a research professor in the department of Physics, Beijing Normal University. His recent research interests include the disorder and dissipation effects on the quantum transport properties of superconducting and topological systems.

References:

[1] H. C. Liu, Haiwen Liu, D. Zhang, X. C. Xie, Phys. Rev. B 102, 174510 (2020). 

[2] Yi Liu, Ziqiao Wang, Xuefeng Zhang, Chaofei Liu, Yongjie Liu, Zhimou Zhou, Junfeng Wang, Qingyan Wang, 

Yanzhao Liu, Chuanying Xi, Mingliang Tian, Haiwen Liu, Ji Feng, X. C. Xie, and Jian Wang, J. Wang, Physical Review X 8, 

021002 (2018). 

[3] Yi Liu, Ziqiao Wang, Pujia Shan, Yue Tang, Chaofei Liu, Cheng Chen, Ying Xing, Qingyan Wang, Haiwen Liu, Xi Lin, 

X. C. Xie, Jian Wang, Nature Communications 10, 3633 (2019). 

[4] Joseph Falson, Yong Xu, Menghan Liao, Yunyi Zang, Kejing Zhu, Chong Wang, Zetao Zhang, Hongchao Liu, 

Wenhui Duan, Ke He, Haiwen Liu, Jurgen H Smet, Ding Zhang, Qi-Kun Xue，Science 367, 1454-1457 (2020). 

[5] H Ji, Haiwen Liu, H. Jiang, X. C. Xie, Advances in Physics: X 6, 1884133 (2021).