Condensed Matter Seminars

Condensed Matter
Thursday, November 11, 2021
3:30 PM
Physics Building, Room 204

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"Quantum spin Hall effect in monolayer WTe2"


Wenjin Zhao , Cornell University
[Host: Prof. Dima Pesin]
ABSTRACT:

WTe2 is an example of a two-dimensional semimetal. It shows incredibly diverse and intriguing behavior such as the quantum spin Hall effect (QSH), superconductivity, ferroelectricity, and excitonic insulator, providing a new platform for studying the interplay between topology and correlations. In this talk I will discuss the helical nature of the QSH edge state in monolayer WTe2 and the proximity effect of a magnet upon it. In the first part, I will describe how we explore the spin-momentum locking in the QSH edge state and determine the spin axis by studying the magnetic anisotropy. In the second part, I will discuss the magnetic coupling between a two-dimensional antiferromagnet, CrI3, and the QSH edge state.

 

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