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  • Letter
  • Open Access

Exciton spin Hall effect in arc-shaped strained WSe2

A. Shubnic1,2, V. Shahnazaryan1,2,*, I. A. Shelykh3,4, and H. Rostami5,†

  • 1Abrikosov Center for Theoretical Physics, MIPT, Dolgoprudnyi, Moscow Region 141701, Russia
  • 2Department of Physics, ITMO University, Saint Petersburg 197101, Russia
  • 3Science Institute, University of Iceland, Dunhagi 3, IS-107, Reykjavik, Iceland
  • 4Russian Quantum Center, Skolkovo IC, Bolshoy Bulvar 30 bld. 1, Moscow 121205, Russia
  • 5Nordita, KTH Royal Institute of Technology and Stockholm University, Hannes Alfvéns väg 12, 10691 Stockholm, Sweden

  • *vanikshahnazaryan@gmail.com
  • †Present address: Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom; hr745@bath.ac.uk
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Phys. Rev. B 109, L201409 – Published 24 May, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L201409

Abstract

Generating a pure spin current using electrons, which have degrees of freedom beyond spin, such as electric charge and valley index, presents challenges. In response, we propose a mechanism based on intervalley exciton dynamics in arc-shaped strained transition metal dichalcogenides (TMDs) to achieve the exciton spin Hall effect in an electrically insulating regime, without the need for an external electric field. The interplay between strain gradients and strain-induced pseudomagnetic fields results in a net Lorentz force on long-lived intervalley excitons in WSe2, carrying nonzero spin angular momentum. This process generates an exciton-mediated pure spin Hall current, resulting in opposite-sign spin accumulations and local magnetization on the two sides of the single-layer arc-shaped TMD. We demonstrate that the magnetic field induced by spin accumulation, at approximately ∼mT, can be detected using techniques such as superconducting quantum interference magnetometry or spatially resolved magneto-optical Faraday and Kerr rotations.

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Phys. Rev. B 109, L201409– Published 24 May, 2024
  • Received 13 November 2023
  • Revised 6 May 2024
  • Accepted 10 May 2024
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