Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface
Abstract
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
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- OSTI Identifier:
- 2208794
- Report Number(s):
- LA-UR-23-20061
Journal ID: ISSN 2053-1583
- Grant/Contract Number:
- 89233218CNA000001; DMR-1157490
- Resource Type:
- Accepted Manuscript
- Journal Name:
- 2D Materials
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 3; Journal ID: ISSN 2053-1583
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; High Magnetic Field Science; TMDs; graphene; valley Zeeman effect; proximity
Citation Formats
Faria Junior, Paulo E., Naimer, Thomas, McCreary, Kathleen M., Jonker, Berend T., Finley, Jonathan J., Crooker, Scott A., Fabian, Jaroslav, and Stier, Andreas V. Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface. United States: N. p., 2023.
Web. doi:10.1088/2053-1583/acd5df.
Faria Junior, Paulo E., Naimer, Thomas, McCreary, Kathleen M., Jonker, Berend T., Finley, Jonathan J., Crooker, Scott A., Fabian, Jaroslav, & Stier, Andreas V. Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface. United States. https://doi.org/10.1088/2053-1583/acd5df
Faria Junior, Paulo E., Naimer, Thomas, McCreary, Kathleen M., Jonker, Berend T., Finley, Jonathan J., Crooker, Scott A., Fabian, Jaroslav, and Stier, Andreas V. Fri .
"Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface". United States. https://doi.org/10.1088/2053-1583/acd5df. https://www.osti.gov/servlets/purl/2208794.
@article{osti_2208794,
title = {Proximity-enhanced valley Zeeman splitting at the WS2/graphene interface},
author = {Faria Junior, Paulo E. and Naimer, Thomas and McCreary, Kathleen M. and Jonker, Berend T. and Finley, Jonathan J. and Crooker, Scott A. and Fabian, Jaroslav and Stier, Andreas V.},
abstractNote = {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.},
doi = {10.1088/2053-1583/acd5df},
journal = {2D Materials},
number = 3,
volume = 10,
place = {United States},
year = {Fri May 26 00:00:00 EDT 2023},
month = {Fri May 26 00:00:00 EDT 2023}
}
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