Observation of surface Dirac dispersion in transition metal dipnictides

ORAL

Abstract

The experimental discovery of Dirac and Weyl Fermions, quasi-particles existing in low energy excitation in condensed matter physics, has paved a new avenue of research interests in condensed matter physics. Recently, the Lorentz-invariance breaking Weyl semimetallic state has been reported in MoP2 and WP2. Arsenic counterparts of these compounds, which also harbor high magnetoresistance, demand the detailed study to investigate the possible semimetallic state possessed by them. Here, we discuss our angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations results on the electronic structures of MoAs2 and WAs2, which reveal the presence of a surface Dirac cone. Our systematic electronic structures analysis reveals the termination dependent electronic structure in these compounds. Our study offers the opportunity to study the various quantum phase transitions within this family.

*This work is supported by the Air Force Office of Scientific Research under Award No. FA9550-17-1-0415 and the startup fund from UCF (M.N.).

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Presenters

  • Gyanendra Dhakal

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

Authors

  • Gyanendra Dhakal

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Md Mofazzel Hosen

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Wei-Chi Chiu

    • Physics, Northeastern University, Boston, Massachusetts 02115, USA
    • Department of Physics, Northeastern University

  • Bahadur Singh

    • SZU-NUS Collaborative Center and International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology, Engineering Technology Research Center for 2D
    • Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA /SZU-NUS Collaborative Center and International Collaborative Laboratory of 2D Materials for
    • Department of Physics, National University of Singapore
    • SZU-NUS Collaborative Center and International Collaborative Laboratory of 2D Materials for Optoelectronic Science \& Technology, Engineering Technology Research Center for 2
    • Department of Physics, Northeastern University
    • Shenzhen University, Shenzhen, China
    • College of Optoelectronic Engineering, Shenzhen University

  • Klauss Dimitri

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Baokai Wang

    • Northeastern University
    • Physics, Northeastern University, Boston, Massachusetts 02115, USA
    • Department of Physics, Northeastern University

  • Firoza Kabir

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida

  • Christopher Sims

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA

  • Sabin Regmi

    • University of Central Florida

  • Hsin Lin

    • Academia Sinica
    • Institute of Physics, Academia Sinica
    • Physics, Academia Sinica, Taipei 11529, Taiwan
    • Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
    • Physics, Academia Sinica
    • Department of Physics, National University of Singapore
    • National University of Singapore
    • Academia Sinica, Taipei, Taiwan

  • Dariusz Kaczorowski

    • Polish Academy of Sciences
    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, Poland
    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences
    • Polish Academy of Science

  • Arun Bansil

    • Northeastern University
    • Department of Physics, Northeastern University

  • Madhab Neupane

    • University of Central Florida
    • Physics, University of Central Florida, Orlando, Florida 32816, USA
    • Physics, University of Central Florida