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arXiv · 1703.08193

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

Y. Jiang·Z. L. Dun·H. D. Zhou·Z. Lu·K. -W. Chen·S. Moon·T. Besara·T. M. Siegrist·R. E. Baumbach·D. Smirnov·Z. Jiang
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Abstract

We report infrared magneto-spectroscopy 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.

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Y. Jiang, Z. L. Dun, H. D. Zhou, Z. Lu, K. -W. Chen, S. Moon, T. Besara, T. M. Siegrist, R. E. Baumbach, D. Smirnov, Z. Jiang. 2017-03-23. Landau level spectroscopy of massive Dirac fermions in single-crystalline ZrTe5 thin flakes. https://doi.org/10.1103/physrevb.96.041101

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