Title

Landau-Level Spectroscopy of Massive Dirac Fermions in Single-Crystalline ZrTe5 Thin Flakes

Abstract

We report infrared magnetospectroscopy studies on thin crystals of an emerging Dirac material ZrTe 5 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.

Department(s)

Physics, Astronomy, and Materials Science

Document Type

Article

DOI

https://doi.org/10.1103/physrevb.96.041101

Rights Information

© 2017 American Physical Society

Publication Date

2017

Journal Title

Physical Review B

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