Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-020-19816-4
Keywords
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Categories
Funding
- EPSRC Doctoral Prize Fellowship scheme [EP/R513313/1]
- European Graphene Flagship Projects [785219, 881603]
- EPSRC [EP/P026850/1, EP/S030751/1, EP/N010345/1, EP/S030719/1]
- EU Quantum Technology Flagship Programs
- Royal Society
- Exeter Time-Resolved Magnetism Facility (EXTREMAG - EPSRC) [EP/R008809/1]
- Tirant III cluster of the Servei d'Informatica of the University of Valencia [vlc82]
- Mare Nostrum cluster of the Barcelona Supercomputing Center [FI-2019-2-0034]
- Marie-CurieCOFUND program Nano TRAIN For Growth II [713640]
- FCT [UTAP-EXPL/NTec/0046/2017]
- Generalitat Valenciana [2017/139]
- MINECO-Spain [MAT2016-78625-C2]
- Elemental Strategy Initiative by the MEXT, Japan
- CREST, J.S.T [JPMJCR15F3]
- European Research Council Synergy Grant Hetero2D
- EPSRC [EP/R008809/1, EP/S030719/1, EP/S030751/1, EP/P026850/1, EP/N010345/1] Funding Source: UKRI
- Fundação para a Ciência e a Tecnologia [UTAP-EXPL/NTec/0046/2017] Funding Source: FCT
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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, moire 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. One advantage of van der Waals materials is the ability to combine different materials in layers to form new heterostructures. Here, the authors investigate heterostructures of CrBr3 and MoSe2, and find that the ferromagnetism of CrBr3 enhances the valley dependent optical response of the MoSe2.
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