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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.

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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