Landau-level spectroscopy of massive Dirac fermions in single-crystalline ZrTe5 thin flakes

被引：37

作者：

Jiang, Y. ^{[1
]}

Dun, Z. L. ^{[2
]}

Zhou, H. D. ^{[2
]}

Lu, Z. ^{[3
,4
]}

Chen, K-W. ^{[3
,4
]}

Moon, S. ^{[3
,4
]}

Besara, T. ^{[3
]}

Siegrist, T. M. ^{[3
,5
]}

Baumbach, R. E. ^{[3
]}

Smirnov, D. ^{[3
]}

Jiang, Z. ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[2] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[3] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[4] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[5] Florida State Univ, FAMU FSU Coll Engn, Dept Chem & Biomed Engn, Tallahassee, FL 32310 USA

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 04期

基金：

美国国家科学基金会;

关键词：

TRANSITION; GRAPHENE;

D O I：

10.1103/PhysRevB.96.041101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report infrared magnetospectroscopy studies on thin crystals of an emerging Dirac material ZrTe5 near the intrinsic limit. The observed structure of the Landau-level transitions and zero-field infrared absorption indicate a two-dimensional Dirac-like electronic structure, similar to that in graphene but with a small relativistic mass corresponding to a 9.4-meV energy gap. Measurements with circularly polarized light reveal a significant electron-hole asymmetry, which leads to splitting of the Landau-level transitions at high magnetic fields. Our model, based on the Bernevig-Hughes-Zhang effective Hamiltonian, quantitatively explains all observed transitions, determining the values of the Fermi velocity, Dirac mass (or gap), electron-hole asymmetry, and electron and hole g factors.

引用

页数：5

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