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Observation of Dirac state in DySb

POSTER

Abstract

Extreme magnetoresistance (XMR), magnetic and structural phase transition, and possible non-trivial topological phases in the rare-earthmonopnictide family have recently invigorated intense research interest. Recent reports have experimentally revealed the presence of a Dirac-like semimetallic phases in some lighter rare earth monopnictide materials. Here we present a systematic ARPES study as well as first-principles calculations of DySb, a potential candidate for hosting a Dirac semi-metal phase. Our studies reveal two hole-like Fermi surface pockets present at the zone center (Gamma) point as well as two elliptical electron-pockets present in the zone corner (X) point of the Brillouin zone (BZ). Interestingly, Rashba-split states are observed at the (X) point of the BZ in a certain momentum direction, which is further supported by our first-principles calculations. A Dirac state is also observed at the (X) point of the BZ in the vicinity of the magnetic transition temperature. Our study opens a new direction to look for Dirac semi-metal states in other members of the rare earth monopnictide family.

Presenters

  • Klauss Dimitri

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

Authors

  • Klauss Dimitri

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

  • Md Mofazzel Hosen

    Univ of Central Florida, University of Central Florida

  • Gyanendra Dhakal

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

  • Baokai Wang

    Northeastern University, Physics, Northeastern University

  • Firoza Kabir

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

  • Christopher Sims

    Univ of Central Florida

  • Sabin Regmi

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

  • Eric Bauer

    Los Alamos National Laboratory, Los Alamos Natl Lab, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos

  • Filip Ronning

    Los Alamos National Laboratory, Los Alamos Natl Lab, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory

  • Arun Bansil

    Northeastern University, Physics, Northeastern University

  • Madhab Neupane

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