Optical spectroscopy of the Weyl semimetal TaAs

被引：160

作者：

Xu, B. ^{[1
]}

Dai, Y. M. ^{[2
]}

Zhao, L. X. ^{[1
]}

Wang, K. ^{[1
]}

Yang, R. ^{[1
]}

Zhang, W. ^{[1
]}

Liu, J. Y. ^{[1
]}

Xiao, H. ^{[1
]}

Chen, G. F. ^{[1
,3
]}

Taylor, A. J. ^{[4
]}

Yarotski, D. A. ^{[2
]}

Prasankumar, R. P. ^{[2
]}

Qiu, X. G. ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603, Beijing 100190, Peoples R China

[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, POB 1663, Los Alamos, NM 87545 USA

[3] Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China

[4] Los Alamos Natl Lab, Associate Directorate Chem Life & Earth Sci, POB 1663, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 12期

关键词：

FERMI ARCS; DISCOVERY; ELECTRON; PHASE; NODES;

D O I：

10.1103/PhysRevB.93.121110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a systematic study of both the temperature and frequency dependence of the optical response in TaAs, a material that has recently been realized to host the Weyl semimetal state. Our study reveals that the optical conductivity of TaAs features a narrow Drude response alongside a conspicuous linear dependence on frequency. The weight of the Drude peak decreases upon cooling, following a T-2 temperature dependence, in good agreement with theoretical predictions. Two linear components with distinct slopes dominate the low-temperature optical conductivity. A comparison between our experimental results and theoretical calculations suggests that the linear conductivity below similar to 230 cm(-1) arises purely from interband transitions near the Weyl points, providing rich information about the Weyl semimetal state in TaAs.

引用

页数：5

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