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Enhanced spin Hall response from aligned Kramers-Weyl points in high Chern number semimetals

C. O. Ascencio1, Wei Jiang2,*, D. J. P. de Sousa2, Seungjun Lee2, Jian-Ping Wang1,2, and Tony Low1,2,†

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 2Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *tj.jwei@gmail.com
  • †tlow@umn.edu
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Phys. Rev. B 108, L201404 – Published 29 November, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L201404

Abstract

We propose a spin Hall effect (SHE) enhancement mechanism due to Kramers-Weyl point (KWP) alignment in chiral topological semimetals with high Chern numbers. Through model Hamiltonian calculations, we identify enhancements in the intrinsic spin Hall conductivity (SHC) and the spin Hall angle (SHA). Such enhancements, attributed to a unique high Chern number KWP energetic alignment and a high degree of band nesting induced by spin-orbit coupling, strongly depend on orbital-orbital interactions. This represents a mechanism to enhance SHE, differing from the spin-orbit induced anticrossing mechanism in gapped systems. Guided by this principle, we corroborate our results by means of first-principles calculations and reveal multiple realistic materials with large intrinsic SHCs and even larger SHAs than Pt.

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Phys. Rev. B 108, L201404– Published 29 November, 2023
  • Received 25 July 2023
  • Accepted 26 October 2023
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