Dimensionality-dependent type-II Weyl semimetal state in Mo0.25 W0.75 Te2

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; Changli Yang; Xiunian Jing; Hsin Lin; Zheng Liu; Li Lu; Guangtong Liu

doi:10.1103/PhysRevB.104.085423

Dimensionality-dependent type-II Weyl semimetal state in Mo0.25 W0.75 Te2

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, Changli Yang, Xiunian Jing, Hsin Lin, Zheng Liu^*, Li Lu, Guangtong Liu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Weyl nodes and Fermi arcs in type-II Weyl semimetals (WSMs) have led to lots of exotic transport phenomena. Recently, Mo0.25W0.75Te2 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 Mo0.25W0.75Te2 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 (Bin2); 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 Mo0.25W0.75Te2. The in situ dimensionality-tuned transport experiment offers an alternative strategy to search for type-II WSMs.

Original language	English
Article number	085423
Journal	Physical Review B
Volume	104
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.104.085423
Publication status	Published - Aug 15 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.104.085423

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title = "Dimensionality-dependent type-II Weyl semimetal state in Mo0.25 W0.75 Te2",

abstract = "Weyl nodes and Fermi arcs in type-II Weyl semimetals (WSMs) have led to lots of exotic transport phenomena. Recently, Mo0.25W0.75Te2 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 Mo0.25W0.75Te2 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 (Bin2); 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 Mo0.25W0.75Te2. The in situ dimensionality-tuned transport experiment offers an alternative strategy to search for type-II WSMs.",

author = "Peiling Li and Ya Deng and Hsu, {Chuang Han} and Chao Zhu and Jian Cui and Xue Yang and Jiadong Zhou and Hung, {Yi Chun} and Jie Fan and Zhongqing Ji and Fanming Qu and Jie Shen and Changli Yang and Xiunian Jing and Hsin Lin and Zheng Liu and Li Lu and Guangtong Liu",

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year = "2021",

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day = "15",

doi = "10.1103/PhysRevB.104.085423",

language = "English",

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T1 - Dimensionality-dependent type-II Weyl semimetal state in Mo0.25 W0.75 Te2

AU - Li, Peiling

AU - Deng, Ya

AU - Hsu, Chuang Han

AU - Zhu, Chao

AU - Cui, Jian

AU - Yang, Xue

AU - Zhou, Jiadong

AU - Hung, Yi Chun

AU - Fan, Jie

AU - Ji, Zhongqing

AU - Qu, Fanming

AU - Shen, Jie

AU - Yang, Changli

AU - Jing, Xiunian

AU - Lin, Hsin

AU - Liu, Zheng

AU - Lu, Li

AU - Liu, Guangtong

PY - 2021/8/15

Y1 - 2021/8/15

N2 - Weyl nodes and Fermi arcs in type-II Weyl semimetals (WSMs) have led to lots of exotic transport phenomena. Recently, Mo0.25W0.75Te2 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 Mo0.25W0.75Te2 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 (Bin2); 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 Mo0.25W0.75Te2. The in situ dimensionality-tuned transport experiment offers an alternative strategy to search for type-II WSMs.

AB - Weyl nodes and Fermi arcs in type-II Weyl semimetals (WSMs) have led to lots of exotic transport phenomena. Recently, Mo0.25W0.75Te2 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 Mo0.25W0.75Te2 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 (Bin2); 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 Mo0.25W0.75Te2. The in situ dimensionality-tuned transport experiment offers an alternative strategy to search for type-II WSMs.

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Dimensionality-dependent type-II Weyl semimetal state in Mo0.25 W0.75 Te2

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