Asymmetric magnetic proximity interactions in MoSe2/CrBr3 van der Waals heterostructures

Choi, Junho; Lane, Christopher A.; Zhu, Jianxin; Crooker, Scott A.

doi:10.1038/s41563-022-01424-w

Asymmetric magnetic proximity interactions in MoSe₂/CrBr₃ van der Waals heterostructures

Journal Article · Mon Dec 19 00:00:00 EST 2022 · Nature Materials

DOI:https://doi.org/10.1038/s41563-022-01424-w· OSTI ID:1909556

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Magnetic proximity interactions between atomically thin semiconductors and two-dimensional magnets provide a means to manipulate spin and valley degrees of freedom in non-magnetic monolayers, without using applied magnetic fields. In such van der Waals heterostructures, magnetic proximity interactions originate in the nanometre-scale coupling between spin-dependent electronic wavefunctions in the two materials, and typically their overall effect is regarded as an effective magnetic field acting on the semiconductor monolayer. Here we demonstrate that magnetic proximity interactions in van der Waals heterostructures can in fact be markedly asymmetric. Valley-resolved reflection spectroscopy of MoSe2/CrBr3 van der Waals structures reveals strikingly different energy shifts in the K and K' valleys of the MoSe2 due to ferromagnetism in the CrBr3 layer. Density functional calculations indicate that valley-asymmetric magnetic proximity interactions depend sensitively on the spin-dependent hybridization of overlapping bands and as such are likely a general feature of hybrid van der Waals structures. Here, these studies suggest routes to control specific spin and valley states in monolayer semiconductors.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); State of Florida; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231

OSTI ID:: 1909556

Report Number(s):: LA-UR-22-25241

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 3 Vol. 22; ISSN 1476-1122

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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