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Observation of topological surface state in a superconducting material

ORAL

Abstract

The discovery of the topological insulator phase has ignited massive research interests in novel quantum materials. Topological materials with superconductivity further invigorate the importance of materials providing the platform to study the interplay between these two unique states. However, the candidates of such materials are rare. Here, we report a systematic angle-resolved photoemission spectroscopy (ARPES) study of superconducting material CaBi2 [ Tc = 2 K], corroborated by the first-principles calculations. Our study reveals the presence of topological Dirac state at the corner-point of the Brillouin zone with topological protection. Furthermore, our transport measurements show the presence of large magnetoresistance in this compound. Our results provide a platform to study the superconductivity and topology in CaBi2.

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Presenters

  • Gyanendra Dhakal

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

Authors

  • Gyanendra Dhakal

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

  • Md Mofazzel Hosen

    Univ of Central Florida, University of Central Florida

  • Ayana Ghosh

    Univ of Connecticut - Storrs, Materials Science and Engineering, University of Connecticut, University of Connecticut

  • Christopher Lane

    Northeastern University, Physics, Northeastern University, Los Alamos National Laboratory

  • Karolina Górnicka

    Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk University of Technology

  • Michal J. Winiarski

    Applied Physics and Mathematics, Gdansk University of Technology, Gdansk University of Technology, Johns Hopkins University

  • Klauss Dimitri

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

  • Firoza Kabir

    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

  • Dariusz Kaczorowski

    Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Polish Academy of Sciences

  • Jian-Xin Zhu

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

  • Tomasz Klimczuk

    Applied Physics and Mathematics, Gdansk University of Technology, Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Gdansk University of Technology

  • Madhab Neupane

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