Electronic structure of a weak topological insulator RhBi<sub>2</sub>

ORAL

Abstract

We report a study of electronic structure of triclinic RhBi2 using laser based angle resolved photoemission spectroscopy (ARPES), DFT calculations, and effective model. We observe two surface Dirac points demonstrating that RhBi2 displays topological surface states (TSS) arising from WTI phase at (100) surface. Our results reveal TSS with saddle points that are located in the vicinity of a Dirac point resulting in a van Hove singularity close to the Fermi energy. Due to the combination of exotic features, this material offers great potential as a material platform for novel quantum effects.

*The research was performed at Ames Laboratory. Ames Laboratory is operated for the U.S. Department of Energy by the Iowa State University under Contract No. DE-AC02-07CH11358. This work was also supported by the Center for Advancement of Topological Semimetals, an Energy Frontier Research Center funded by the U.S. Department of Energy Office of Science, Office of Basic Energy Sciences, through the Ames Laboratory under its Contract No. DE-AC02-07CH11358 and Trinity college, the Marie Curie program under EC Grant agreement No. 842901 and the Winton program at the University of Cambridge.

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Presenters

  • Kyungchan Lee

    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory/Iowa State University

Authors

  • Kyungchan Lee

    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory/Iowa State University

  • Gunnar F Lange

    • TCM Group, Cavendish Laboratory, University of Cambridge

  • Lin-Lin Wang

    • Ames Laboratory
    • Ames Laboratory/Iowa State University
    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory

  • Brinda Kuthanazhi

    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory/Iowa State University

  • Thais Victa Trevisan

    • Ames Lab
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, Iowa State University

  • Na Hyun Jo

    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory/Iowa State University

  • Benjamin Schrunk

    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory

  • Peter Orth

    • Department of Physics and Astronomy, Ames Laboratory, Iowa State University
    • Iowa State University
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, Iowa State University

  • Robert-Jan Slager

    • University of Cambridge
    • TCM Group, Cavendish Laboratory, University of Cambridge
    • TCM Group, Cavendish Laboratory/ Department of Physics, University of Cambridge/ Harvard University
    • Harvard University

  • Paul C Canfield

    • Iowa State University/ Ames Laboratory
    • Ames Laboratory
    • Ames Laboratory, Iowa State University
    • Iowa State University
    • Ames Lab/Iowa State
    • Ames Laboratory, Ames, IA
    • Iowa State University/AmesLab
    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Department of Physics & Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory, U.S. Department of Energy, and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory/Iowa State University

  • Adam Kaminski

    • Department of Physics and Astronomy, Iowa State University/Ames Laboratory
    • Ames Laboratory/Iowa State University