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Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe2/CrBr3 van der Waals heterostructures

Author

Listed:
  • T. P. Lyons

    (The University of Sheffield)

  • D. Gillard

    (The University of Sheffield)

  • A. Molina-Sánchez

    (International Iberian Nanotechnology Laboratory)

  • A. Misra

    (The University of Manchester
    Indian Institute of Technology Madras (IIT Madras))

  • F. Withers

    (University of Exeter)

  • P. S. Keatley

    (University of Exeter)

  • A. Kozikov

    (The University of Manchester)

  • T. Taniguchi

    (National Institute for Materials Science)

  • K. Watanabe

    (National Institute for Materials Science)

  • K. S. Novoselov

    (The University of Manchester
    National University of Singapore
    Liangjiang New Area)

  • J. Fernández-Rossier

    (International Iberian Nanotechnology Laboratory)

  • A. I. Tartakovskii

    (The University of Sheffield)

Abstract

Semiconducting ferromagnet-nonmagnet interfaces in van der Waals heterostructures present a unique opportunity to investigate magnetic proximity interactions dependent upon a multitude of phenomena including valley and layer pseudospins, moiré periodicity, or exceptionally strong Coulomb binding. Here, we report a charge-state dependency of the magnetic proximity effects between MoSe2 and CrBr3 in photoluminescence, whereby the valley polarization of the MoSe2 trion state conforms closely to the local CrBr3 magnetization, while the neutral exciton state remains insensitive to the ferromagnet. We attribute this to spin-dependent interlayer charge transfer occurring on timescales between the exciton and trion radiative lifetimes. Going further, we uncover by both the magneto-optical Kerr effect and photoluminescence a domain-like spatial topography of contrasting valley polarization, which we infer to be labyrinthine or otherwise highly intricate, with features smaller than 400 nm corresponding to our optical resolution. Our findings offer a unique insight into the interplay between short-lived valley excitons and spin-dependent interlayer tunneling, while also highlighting MoSe2 as a promising candidate to optically interface with exotic spin textures in van der Waals structures.

Suggested Citation

  • T. P. Lyons & D. Gillard & A. Molina-Sánchez & A. Misra & F. Withers & P. S. Keatley & A. Kozikov & T. Taniguchi & K. Watanabe & K. S. Novoselov & J. Fernández-Rossier & A. I. Tartakovskii, 2020. "Interplay between spin proximity effect and charge-dependent exciton dynamics in MoSe2/CrBr3 van der Waals heterostructures," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19816-4
    DOI: 10.1038/s41467-020-19816-4
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    Cited by:

    1. Farsane Tabataba-Vakili & Huy P. G. Nguyen & Anna Rupp & Kseniia Mosina & Anastasios Papavasileiou & Kenji Watanabe & Takashi Taniguchi & Patrick Maletinsky & Mikhail M. Glazov & Zdenek Sofer & Anvar , 2024. "Doping-control of excitons and magnetism in few-layer CrSBr," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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