Magnetization fluctuations on the surface of a magnetically-doped topological insulator

ORAL

Abstract

Ordering of magnetic impurities on the surface of a topological insulator gaps out the surface states and gives rise to anomalous quantum Hall effect, as demonstrated in recent experiments [1, 2]. Here we study theoretically fluctuation phenomena that occur in the vicinity of the ferromagnetic transition in such magnetically-doped topological insulators. We calculate the density of states of the electronic excitations and study transport properties in the fluctuation region. \\[4pt] [1] S.Y. Xu et al., Nature Phys. 8, 616 (2012). \\[0pt] [2] Y. L. Chen et al., Science 329, 659 (2010).

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Authors

  • Dmitry Efimkin

    Condensed Matter Theory Center, University of Maryland, College Park, MD, CMTC, Dept. of Physics, University of Maryland at College Park

  • Victor Galitski

    Condensed Matter Theory Center, University of Maryland, College Park, MD and Joint Quantum Institute, University of Maryland, College Park, MD, CMTC, Dept. of Physics, University of Maryland at College Park, University of Maryland, College Park, University of Maryland at College Park, University of Maryland, Univ of Maryland-College Park