【直播】【人大物理学系】Prof. Kam Tuen Law: Giant magneto-electric effect...

本系列报告由中国人民大学物理学系主办，于2021年6月25日12:30开始，授权蔻享学术进行网络直播。

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Giant magneto-electric effect and spin-orbit-parity coupled superconductivity in atomically thin 2D materials

报告人

Prof. Kam Tuen Law (Hong Kong University of Science & Technology)

时   间

2021年6月25日 12:30

In recent years, interacting, topological and superconducting phases have been discovered in atomically thin two-dimensional materials such as in transition metal dichalcogenides (TMDs) and 2D moiré materials. In this talk, I would like to discuss:

1. The current-induced magnetization switching in twisted bilayer graphene. Recently, quantum anomalous Hall effect with spontaneous ferromagnetism was observed in twisted bilayer graphenes (TBG) near ¾ filling by Goldhaber-Gordon’s group at Stanford and Young’s group at UCSB. Importantly, it was observed that an extremely small current can switch the direction of the magnetization. This offers the prospect of realizing low energy dissipation magnetic memories.  However, the mechanism of the current-driven magnetization switching is poorly understood as the charge currents in graphene are generally believed to be non-magnetic. In this talk, the observed current-induced magnetization effect will be explained.

2. The properties of superconducting, topological, monolayer 1T’-WTe₂.

Experimentally, 1T’-WTe₂ is a centrosymmetric superconductor with upper critical field several times larger than the Pauli limit. We explained that the enhanced upper critical field is due to the so-called spin-orbit-parity coupling which is important for materials with topological band inversion.

报告人简介

图 | Prof. Kam Tuen LawProf. K.T. Law is a condensed matter theorist. He is a graduate of The Hong Kong University of Science and Technology. He moved to Brown University for PhD study in 2003 and graduated in 2008. After spending one year as a joint postdoc fellow of HKUST-IAS and MIT, he moved to MIT in 2009 as a Croucher Postdoc Fellow. He joined the HKUST physics department in 2011 and currently the Dr. Tai-chin Lo Associate Professor of Science. He was awarded the Croucher Innovation Award, the RGC Research Fellowship and the founding president of the Hong Kong Young Academy of Sciences.

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