Surface charge conductivity of a topological insulator in a magnetic field: The effect of hexagonal warping

Article

关键词: ANISOTROPIC MAGNETORESISTANCE;    QUANTUM TRANSPORT;    DIRAC FERMIONS;    HALL INSULATOR;    GRAPHENE;    BI2SE3;    STATE;   

DOI  :  10.1103/PhysRevB.97.075421

来源: SCIE

【 摘 要 】

We investigate the influence of hexagonal warping on the transport properties of topological insulators. We study the charge conductivity within Kubo formalism in the first Born approximation using low-energy expansion of the Hamiltonian near the Dirac point. The effects of disorder, magnetic field, and chemical-potential value are analyzed in detail. We find that the presence of hexagonal warping significantly affects the conductivity of the topological insulator. In particular, it gives rise to the growth of the longitudinal conductivity with the increase of the disorder and anisotropic anomalous in-plane magnetoresistance. Hexagonal warping also affects the quantum anomalous Hall effect and anomalous out-of-plane magnetoresistance. The obtained results are consistent with the experimental data.

【 授权许可】

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