AUTHOR=Jia Taoyuan , Meng Weizhen , Zhang Haopeng , Liu Chunhai , Dai Xuefang , Zhang Xiaoming , Liu Guodong 

TITLE=Weyl Fermions in VI3 Monolayer

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00722

DOI=10.3389/fchem.2020.00722

ISSN=2296-2646

ABSTRACT=<p>We report the presence of a Weyl fermion in VI<sub>3</sub> monolayer. The material shows a sandwich-like hexagonal structure and stable phonon spectrum. It has a half-metal band structure, where only the bands in one spin channel cross the Fermi level. There are three pairs of Weyl points slightly below the Fermi level in spin-up channel. The Weyl points show a clean band structure and are characterized by clear Fermi arcs edge state. The effects of spin-orbit coupling, electron correlation, and lattice strain on the electronic band structure were investigated. We find that the half-metallicity and Weyl points are robust against these perturbations. Our work suggests VI<sub>3</sub> monolayer is an excellent Weyl half-metal.</p>