Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface

Faria Junior, Paulo E.; Naimer, Thomas; McCreary, Kathleen M.; Jonker, Berend T.; Finley, Jonathan J.; Crooker, Scott A.; Fabian, Jaroslav; Stier, Andreas V.

doi:10.1088/2053-1583/acd5df

Title: Proximity-enhanced valley Zeeman splitting at the WS₂/graphene interface

Journal Article · Fri May 26 00:00:00 EDT 2023 · 2D Materials

DOI:https://doi.org/10.1088/2053-1583/acd5df· OSTI ID:2208794

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^[2]; Jonker, Berend T. ^[2]; Finley, Jonathan J. ^[3];

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University of Regensburg (Germany)
Naval Research Laboratory (NRL), Washington, DC (United States)
Technische Universität München, Garching (Germany)
National High Magnetic Field Laboratory, Los Alamos, NM (United States)
Technische Universität München, Garching (Germany); National High Magnetic Field Laboratory, Los Alamos, NM (United States)

The valley Zeeman physics of excitons in monolayer transition metal dichalcogenides provides valuable insight into the spin and orbital degrees of freedom inherent to these materials. Being atomically-thin materials, these degrees of freedom can be influenced by the presence of adjacent layers, due to proximity interactions that arise from wave function overlap across the 2D interface. Here, we report 60 T magnetoreflection spectroscopy of the A- and B- excitons in monolayer WS₂, systematically encapsulated in monolayer graphene. While the observed variations of the valley Zeeman effect for the A- exciton are qualitatively in accord with expectations from the bandgap reduction and modification of the exciton binding energy due to the graphene-induced dielectric screening, the valley Zeeman effect for the B- exciton behaves markedly different. We investigate prototypical WS₂/graphene stacks employing first-principles calculations and find that the lower conduction band of WS₂ at the K / K ′ valleys (the <:tex-math> C B − band) is strongly influenced by the graphene layer on the orbital level. Specifically, our detailed microscopic analysis reveals that the conduction band at the Q point of WS₂ mediates the coupling between C B − and graphene due to resonant energy conditions and strong coupling to the Dirac cone. This leads to variations in the valley Zeeman physics of the B- exciton, consistent with the experimental observations. Our results therefore expand the consequences of proximity effects in multilayer semiconductor stacks, showing that wave function hybridization can be a multi-step energetically resonant process, with different bands mediating the interlayer interactions. Such effects can be further exploited to resonantly engineer the spin-valley degrees of freedom in van der Waals and moiré heterostructures.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; DMR-1157490

OSTI ID:: 2208794

Report Number(s):: LA-UR-23-20061

Journal Information:: 2D Materials, Vol. 10, Issue 3; ISSN 2053-1583

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
High Magnetic Field Science
TMDs
graphene
valley Zeeman effect
proximity

Title: Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface

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Title: Proximity-enhanced valley Zeeman splitting at the WS₂/graphene interface