Charge transport and shot noise on the surface of a topological insulator with a magnetic modulation |
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Authors: | Yuan Jian-Hui Cheng Ze Zhang Jian-Jun Zeng Qi-Jun Zhang Jun-Pei |
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Institution: | School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract: | In this paper, we investigate the transport features and the Fano factor of Dirac electrons on the surface of a three-dimensional topological insulator with a magnetic modulation. We consider a hard wall bounding condition on the edge of the topological insulator, which implies that a surface state of the topological insulator is insulating. We find that a valley of conductivity at the Dirac point is associated with a Fano factor peak, and more interestingly, this topological metal changes from insulating to metallic by controlling the effective exchange field. |
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Keywords: | topological insulator electronic transport ferrimagnetic |
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