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Title: Dimensionality-dependent type-II Weyl semimetal state in Mo₀.₂₅W₀.₇₅Te₂
Authors: Li, Peiling
Deng, Ya
Hsu, Chuang-Han
Zhu, Chao
Cui, Jian
Yang, Xue
Zhou, Jiadong
Hung, Yi-Chun
Fan, Jie
Ji, Zhongqing
Qu, Fanming
Shen, Jie
Yang, Changli
Jing, Xiunian
Lin, Hsin
Liu, Zheng
Lu, Li
Liu, Guangtong
Keywords: Engineering::Materials
Issue Date: 2021
Source: Li, P., Deng, Y., Hsu, C., Zhu, C., Cui, J., Yang, X., Zhou, J., Hung, Y., Fan, J., Ji, Z., Qu, F., Shen, J., Yang, C., Jing, X., Lin, H., Liu, Z., Lu, L. & Liu, G. (2021). Dimensionality-dependent type-II Weyl semimetal state in Mo₀.₂₅W₀.₇₅Te₂. Physical Review B, 104(8), 085423-.
Project: RG4/17 
Journal: Physical Review B 
Abstract: Weyl nodes and Fermi arcs in type-II Weyl semimetals (WSMs) have led to lots of exotic transport phenomena. Recently, Mo$_{0.25}$W$_{0.75}$Te$_{2}$ has been established as a type-II WSM with Weyl points located near Fermi level, which offers an opportunity to study its intriguing band structure by electrical transport measurements. Here, by selecting a special sample with the thickness gradient across two- (2D) and three-dimensional (3D) regime, we show strong evidences that Mo$_{0.25}$W$_{0.75}$Te$_{2}$ is a type-II Weyl semimetal by observing the following two dimensionality-dependent transport features: 1) A chiral-anomaly-induced anisotropic magneto-conductivity enhancement, proportional to the square of in-plane magnetic field (B$_{in}$$^{2}$); 2) An additional quantum oscillation with thickness-dependent phase shift. Our theoretical calculations show that the observed quantum oscillation originates from a Weyl-orbit-like scenario due to the unique band structure of Mo$_{0.25}$W$_{0.75}$Te$_{2}$. The in situ dimensionality-tuned transport experiment offers a new strategy to search for type-II WSMs.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.104.085423
Schools: School of Materials Science and Engineering 
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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