Non-local Influence of the local ferromagnetic impurities on electronic structure of the topological insulator Cr<sub>0.08</sub>(Bi<sub>0.1</sub>Sb<sub>0.9</sub>)<sub>1.92</sub>Te<sub>3</sub>

ORAL

Abstract

Magnetic impurities break a time-reversal symmetry of topological insulator(TI) and generate a back scattering between the surface states. As a result, a gap opens at the time-reversal invariant momentum and the electronic properties of TI’s undergo a drastic change. We investigated the local density of states(LDOS) of Cr doped TI (Cr0.08(Bi0.1Sb0.9)1.92Te3) using the spectroscopic imaging scanning tunneling microscopy(SI-STM) and found that there are two types of impurities: one kind from the 1st Bi-Sb layer and another kind from the 2nd Bi-Sb layer. We found that the local Dirac gap magnitude are more correlated to the position of impurities from the 2nd layer and the quasi-particle interference shows a trace of the back scattering which is prohibited in the undoped TI’s. We will also present a Spectroscopic feature near the Fermi energy and its possible implication.

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Presenters

  • Jung Hoon Yoo

    • Seoul National University; CCES-IBS

Authors

  • Jung Hoon Yoo

    • Seoul National University; CCES-IBS

  • Sang Hyun Joo

    • Seoul National University; CCES-IBS

  • Min Seok Park

    • Seoul National University; CCES-IBS

  • Sung Jun Park

    • Seoul National University; CCES-IBS

  • Kyoung Seok Lee

    • Seoul National University; CCES-IBS

  • Jae-joon Kim

    • Seoul National University; CCES-IBS

  • Genda Gu

    • Brookhaven National Laboratory
    • Brookhaven National Labs
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
    • Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory
    • Condensed Matter &materials Science, Brookhaven Natl Lab
    • Brookhaven Natl Lab
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven Natl. Lab
    • Brookhaven National Lab
    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • brookhaven national laboratory

  • Jinho Lee

    • Seoul National University; CCES-IBS