Experimental Observation of Anisotropic Adler-Bell-Jackiw Anomaly in Type-II Weyl Semimetal WTe1.98 Crystals at the Quasiclassical Regime

被引：123

作者：

Lv, Yang-Yang ^{[1
,2
]}

Li, Xiao ^{[2
,3
]}

Zhang, Bin-Bin ^{[1
,2
]}

Deng, W. Y. ^{[2
,3
]}

Yao, Shu-Hua ^{[1
,2
]}

Chen, Y. B. ^{[2
,3
]}

Zhou, Jian ^{[1
,2
]}

Zhang, Shan-Tao ^{[1
,2
]}

Lu, Ming-Hui ^{[1
,2
]}

Zhang, Lei

Tian, Mingliang ^{[4
,5
]}

Sheng, L. ^{[2
,3
,4
]}

Chen, Yan-Feng ^{[1
,2
,4
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[4] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[5] Chinese Acad Sci, High Field Magnet Lab, Hefei 230031, Anhui, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 09期

基金：

中国国家自然科学基金;

关键词：

MAGNETORESISTANCE;

D O I：

10.1103/PhysRevLett.118.096603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The asymmetric electron dispersion in type-II Weyl semimetal theoretically hosts anisotropic transport properties. Here, we observe the significant anisotropic Adler-Bell-Jackiw (ABJ) anomaly in the Fermi-level delicately adjusted WTe1.98 crystals. Quantitatively, C-W, a coefficient representing the intensity of the ABJ anomaly along the a and b axis of WTe1.98 are 0.030 and 0.051 T- 2 at 2 K, respectively. We found that the temperature-sensitive ABJ anomaly is attributed to a topological phase transition from a type-II Weyl semimetal to a trivial semimetal, which is verified by a first-principles calculation using experimentally determined lattice parameters at different temperatures. Theoretical electrical transport study reveals that the observation of an anisotropic ABJ along both the a and b axes in WTe1.98 is attributed to electrical transport in the quasiclassical regime. Our work may suggest that electron-doped WTe2 is an ideal playground to explore the novel properties in type-II Weyl semimetals.

引用

页数：5

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