Temperature-dependent electronic structure in a higher order topological insulator candidate EuIn<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

Higher order topological insulator (HOTI) is a novel quantum topological phase with gapless states along the hinges of a crystal. Despite theoretical predictions in several potential materials, enough experimental studies on crystalline HOTI materials is still lacking. The interplay of magnetism and topology has been shown to give rise to various magnetic topological states, including axion insulator and HOTI states. In this talk, we will present a systematic study on the electronic structure of EuIn2As2 and its evolution across the antiferromagnetic transition below 16 K by utilizing high-resolution angle-resolved photoemission spectroscopy combined with parallel first-principles computation. The antiferromagnetic EuIn2As2 has been predicted to host both the axion and the HOTI states. We directly observe the linearly dispersing hole-like bands crossing the Fermi level and the change in their dispersion across the magnetic phase transition. Our study points to EuIn2As2 as being a promising material to explore interplay between topology and magnetism.

*This work is supported by U.S. AFOSR Grant No. FA9550-17-1-0415 and NSF CAREER Grant No. DMR-1847962.

–

Presenters

  • Sabin Regmi

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

Authors

  • Sabin Regmi

    • 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

  • Barun Ghosh

    • Department of Physics, Indian Institute Of Technology Kanpur
    • Department of Physics, Indian Institute of Technology Kanpur, India
    • Department of Physics, Indian Institute of Technology Kanpur

  • Bahadur Singh

    • Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research
    • Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research
    • Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research
    • Tata Institute of Fundamental Research
    • Tata Institute for Fundamental Research
    • DCMPMS, Tata Institute of Fundamental Research, India
    • Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research
    • Department of Condensed Matter Physics & Materials Science, Tata Institute of Fundamental Research

  • Gyanendra Dhakal

    • 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

  • Baokai Wang

    • Department of Physics, Northeastern University
    • Northeastern University
    • Department of Physics, Northeastern University, USA

  • Firoza Kabir

    • University of Central Florida
    • Physics, 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

  • Yangyang Liu

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

  • Amit Agarwal

    • Department of Physics, Indian Institute Of Technology Kanpur
    • Indian Institute of Technology
    • Department of Physics, Indian Institute of Technology Kanpur, India
    • Department of Physics, Indian Institute of Technology Kanpur

  • Hsin Lin

    • Institute of Physics, Academia Sinica
    • Academia Sinica
    • Institute of Physics, Academia Sinica, Taipei
    • Institute of Physics, Academia Sinica, Taiwan
    • Physics, Academia Sinica

  • Dariusz Kaczorowski

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

  • Arun Bansil

    • Department of Physics, Northeastern University
    • Northeastern University
    • NU
    • Department of Physics, Northeastern University, USA

  • Madhab Neupane

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