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Disorder effect on magneto-transport on the surface of a topological insulator

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arxiv 1503.04953 v2 pith:Q5DQG7Y4 submitted 2015-03-17 cond-mat.mes-hall

Disorder effect on magneto-transport on the surface of a topological insulator

classification cond-mat.mes-hall
keywords magneto-transportsurfaceconfigurationdisorderferromagnetin-planeinsulatormagnetization
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the magneto-transport properties on the disordered surface of a topological insulator attached with a ferromagnet/ferromagnet junction. Since, in the surface Dirac Hamiltonian, out-of-plane magnetization induces a mass gap, while in-plane magnetization has a role of the effective vector potential, the mechanism of magneto-transport is different between these two cases. The former is similar to the conventional one in ferromagnetic metals, while the latter is due to the shift of Fermi circles in momentum space. Our numerical calculations show that the magnetoconductance in in-plane configuration is robust against disorder compared to that in out-of-plane configuration.

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