物理
类型(生物学)
半金属
Weyl半金属
维数之咒
凝聚态物理
各向异性
量子力学
机器学习
带隙
地质学
计算机科学
古生物学
作者
Peiling Li,Ya Deng,Chuang‐Han Hsu,Chao Zhu,Jian Cui,Xue Yang,Jiadong Zhou,Yi-Chun Hung,Jie Fan,Zhongqing Ji,Fanming Qu,Jie Shen,Ciqiu Yang,Xiunian Jing,Hsin Lin,Zheng Liu,Li Lü,Guangtong Liu
出处
期刊:Physical review
日期:2021-08-23
卷期号:104 (8)
被引量:2
标识
DOI:10.1103/physrevb.104.085423
摘要
Weyl nodes and Fermi arcs in type-II Weyl semimetals (WSMs) have led to lots of exotic transport phenomena. Recently, ${\mathrm{Mo}}_{0.25}{\mathrm{W}}_{0.75}{\mathrm{Te}}_{2}$ 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) regimes, we show strong evidence that ${\mathrm{Mo}}_{0.25}{\mathrm{W}}_{0.75}{\mathrm{Te}}_{2}$ is a type-II Weyl semimetal by observing the following two dimensionality-dependent transport features: (1) a chiral-anomaly-induced anisotropic magnetoconductivity enhancement, proportional to the square of in-plane magnetic field (${B}_{\mathrm{in}}^{2}$); and (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 ${\mathrm{Mo}}_{0.25}{\mathrm{W}}_{0.75}{\mathrm{Te}}_{2}$. The in situ dimensionality-tuned transport experiment offers an alternative strategy to search for type-II WSMs.
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