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

Lookup NU author(s): Dr Aleksey KozikovORCiD, Dr Denis Taniguchi



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


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.

Publication metadata

Author(s): Lyons TP, Gillard D, Molina-Sánchez A, Misra A, Withers F, Keatley PS, Kozikov A, Taniguchi T, Watanabe K, Novoselov KS, Fernández-Rossier J, Tartakovskii AI

Publication type: Article

Publication status: Published

Journal: Nature Communications

Year: 2020

Volume: 11

Online publication date: 26/11/2020

Acceptance date: 30/10/2020

Date deposited: 08/02/2021

ISSN (print): 0028-0836

ISSN (electronic): 2041-1723

Publisher: Nature Publishing Group


DOI: 10.1038/s41467-020-19816-4


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Funder referenceFunder name
EU Quantum Technology Flagship Programs
European Research Council Synergy Grant Hetero2D
the Royal Society