Surface state single Dirac cone in magnetic material Gd<sub>x</sub>Sb<sub>2-x</sub>Te<sub>3.</sub>

ORAL

Abstract

Three-dimensional topological insulators (TI) have emerged as novel states in condensed matter physics. The surface states of a 3D TI are composed of odd number of massless Dirac cones in a Brillouin zone. The existence of these Dirac cones on the surface is characterized by the Z2 topological invariant. Strongly spin-orbit coupled material Sb2Te3 and most of its doped materials belong to the Z2 topological-insulator class. Using a combination of first-principles calculations, magneto transport properties and angle resolved photoemission spectroscopy (ARPES), we directly show that GdxSb2-xTe3 is a large spin-orbit-induced indirect bulk bandgap magnetic material whose surface is characterized by a single topological spin-Dirac cone. We demonstrate that the dynamics of spin Dirac fermions of Sb2Te3 can be controlled through Gd doping, making this magnetic material classes potentially suitable for topological device applications.

*This project is supported by 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

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

Authors

  • Firoza Kabir

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

  • M. Mofazzel Hosen

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

  • Xiaxin Ding

    • Idaho National Laboratory
    • Idaho national lab

  • Gyanendra Dhakal

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

  • Klauss Dimitri

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

  • Christopher Sims

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

  • Sabin Regmi

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

  • William Neff

    • Univ of Central Florida
    • University of Central Florida

  • Jian-Xin Zhu

    • Los Alamos National Laboratory
    • Los Alamos National Lab
    • Los Alamos Natl Lab
    • Theoretical Division, Los Alamos National Laboratory

  • Arjun K Pathak

    • Ames lab

  • Krzysztof Gofryk

    • Idaho national lab
    • Idaho National Laboratory

  • Madhab Neupane

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