Effect of dilute magnetism in a topological insulator

ORAL

Abstract

Three-dimensional topological insulators (TI) have emerged as a unique state of quantum matter and generated enormous interests in condensed matter physics. The surfaces of a three-dimensional (3D) TI are composed of a massless Dirac cone, which is characterized by the Z2 topological invariant. Here, by using a combination of first principles calculations, magneto-transport, angle-resolved photoemission spectroscopy (ARPES), and time resolved ARPES (tr-ARPES), we study the electronic properties of Gadolinium (Gd) doped Sb2Te3. Our study shows that Gd doped Sb2Te3 is a spin-orbit-induced bulk band-gap material, whose surface is characterized by a single topological surface state. Introducing dilute 4f-electron magnetism into the Sb2Te3 TI system by Gd doping creates surface magnetism in this system. Our results provide a new platform to investigate the interaction between dilute magnetism and topology in doped topological materials.

*This work is supported by the Air Force Office of Scientific Research under Award No. FA9550-17-1-0415 and the Center for Thermal Energy Transport under Irradiation, an Energy Frontier Research Center funded by the U.S. DOE, Office of Basic Energy Sciences.

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Presenters

  • Firoza Kabir

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

Authors

  • Firoza Kabir

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Md Mofazzel Hosen

    • University of Central Florida
    • Physics, Boston College
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Xiaxin Ding

    • Idaho National Laboratory
    • Idaho Natl Lab

  • Christopher Lane

    • LANL
    • Theoretical Division, Los Alamos National Laboratory
    • Theoretical Division/Center for Integrated Nanotechnology, Los Alamos National Laboratory
    • Los Alamos National Laboratory

  • Gyanendra Dhakal

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Yangyang Liu

    • Physics, University of Central Florida
    • University of Central Florida
    • Department of Physics, University of Central Florida

  • Klauss Dimitri

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Christopher Sims

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Sabin Regmi

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Luis Persaud

    • Physics, University of Central Florida
    • University of Central Florida

  • Yong Liu

    • Ames Lab
    • Institute of Physics, Ecole Polytechnique Federale de Lausanne
    • Ames Laboratory

  • Arjun Pathak

    • Department of Physics, SUNY Buffalo
    • Physics, Buffalo State College
    • Sunny Buffalo state college

  • Jian-Xin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Theoretical Division/Center for Integrated Nanotechnology, Los Alamos National Laboratory
    • Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Lab
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory

  • Krzysztof Gofryk

    • Idaho National Laboratory
    • Idaho National Lab

  • Madhab Neupane

    • University of Central Florida
    • Physics, University of Central Florida
    • Univ of Central Florida
    • Department of Physics, University of Central Florida