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Non-orthogonal spin-momentum locking in strongly spin-orbit coupled materials

ORAL

Abstract

Orthogonal spin-momentum locking is a general feature of the Rashba spin-orbit coupled surfaces. Recently, experimental evidence for non-orthogonal spin-momentum locking (NOSML) has been reported on the topological surface of α-Sn. [1] Here, we discuss the non-magnetic impurity scattering as a candidate mechanism to this isotropic NOSML state. Our results are applicable to spin-orbit coupled systems generally and are not limited to topological states. The NOSML state is of interest in understanding and identifying spin-orbit dependent phenomena and their spectroscopic signatures in topological and non-topological materials.

[1] Scholz, M. R. et al., Topological surface state of α-Sn on InSb(001) as studied by photoemission, Phys. Rev. B 97, 075101 (2018).

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Presenters

  • Wei-Chi Chiu

    Department of Physics, Northeastern University

Authors

  • Wei-Chi Chiu

    Department of Physics, Northeastern University

  • Tugrul Hakioglu

    Energy Institute and Department of Physics, Istanbul Technical University

  • Robert Markiewicz

    Department of Physics, Northeastern University, Northeastern University

  • 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

  • Arun Bansil

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