Superposition of intra- and inter-layer excitons in twistronic MoSe2/WSe2 bilayers probed by resonant Raman scattering
Superposition of intra- and inter-layer excitons in twistronic MoSe2/WSe2 bilayers probed by resonant Raman scattering
Hybridisation of electronic bands of two-dimensional materials, assembled into twistronic heterostructures, enables one to tune their optoelectronic properties by selecting conditions for resonant interlayer hybridisation. Resonant interlayer hybridisation qualitatively modifies the excitons in such heterostructures, transforming these optically active modes into superposition states of interlayer and intralayer excitons. For MoSe2/WSe2 heterostructures, strong hybridization of both single particle and excitonic states can occur via single particle tunneling. Here we use resonance Raman scattering to provide direct evidence for the hybridisation of excitons in twistronic MoSe2/WSe2 structures, by observing scattering of specific excitons by phonons in both WSe2 and MoSe2. We also demonstrate that resonance Raman scattering spectroscopy opens up a wide range of possibilities for quantifying the layer composition of the superposition states of the exciton and the interlayer hybridisation parameters in heterostructures of two-dimensional materials.
Heterobilayers, Hybridised excitons, Resonance Raman spectroscopy, Transition metal dichalcogenides
Mcdonnell, Liam
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Viner, Jacob
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Ruiz-Tijerina, David
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Rivera, Pasqual
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Xu, Xiaodong
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Fal'ko, Vladimir
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Smith, David C.
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July 2021
Mcdonnell, Liam
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Viner, Jacob
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Ruiz-Tijerina, David
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Rivera, Pasqual
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Xu, Xiaodong
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Fal'ko, Vladimir
2bcc7a4b-d57c-4bd4-8516-15f82727f5e4
Smith, David C.
d9b2c02d-b7ea-498b-9ea1-208a1681536f
Mcdonnell, Liam, Viner, Jacob, Ruiz-Tijerina, David, Rivera, Pasqual, Xu, Xiaodong, Fal'ko, Vladimir and Smith, David C.
(2021)
Superposition of intra- and inter-layer excitons in twistronic MoSe2/WSe2 bilayers probed by resonant Raman scattering.
2D Materials, 8 (3), [035009].
(doi:10.1088/2053-1583/abe778).
Abstract
Hybridisation of electronic bands of two-dimensional materials, assembled into twistronic heterostructures, enables one to tune their optoelectronic properties by selecting conditions for resonant interlayer hybridisation. Resonant interlayer hybridisation qualitatively modifies the excitons in such heterostructures, transforming these optically active modes into superposition states of interlayer and intralayer excitons. For MoSe2/WSe2 heterostructures, strong hybridization of both single particle and excitonic states can occur via single particle tunneling. Here we use resonance Raman scattering to provide direct evidence for the hybridisation of excitons in twistronic MoSe2/WSe2 structures, by observing scattering of specific excitons by phonons in both WSe2 and MoSe2. We also demonstrate that resonance Raman scattering spectroscopy opens up a wide range of possibilities for quantifying the layer composition of the superposition states of the exciton and the interlayer hybridisation parameters in heterostructures of two-dimensional materials.
Text
Accepted_Manuscript
- Accepted Manuscript
More information
Accepted/In Press date: 18 February 2021
Published date: July 2021
Additional Information:
Funding Information:
This research was supported by UK Engineering and Physical Sciences Research Council via program grant EP/N035437/1 and grants EP/S019367/1, EP/S030719/1, EP/N010345/1, EP/V007033/1. VF acknowledges ERC Synergy Grant Hetero2D and EU Quantum Technology Flagship project 2D-SIPC. Both L P M and J V were supported by EPSRC DTP funding. The work at U Washington was funded by the Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division (DESC0018171). D R-T was funded by UNAM-DGAPA.
Publisher Copyright:
© 2021 The Author(s). Published by IOP Publishing Ltd
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords:
Heterobilayers, Hybridised excitons, Resonance Raman spectroscopy, Transition metal dichalcogenides
Identifiers
Local EPrints ID: 448342
URI: http://eprints.soton.ac.uk/id/eprint/448342
ISSN: 2053-1583
PURE UUID: c5b7c887-1a4b-4237-b2ea-248d6a4b6919
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Date deposited: 20 Apr 2021 16:34
Last modified: 17 Mar 2024 06:22
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Contributors
Author:
Liam Mcdonnell
Author:
Jacob Viner
Author:
David Ruiz-Tijerina
Author:
Pasqual Rivera
Author:
Xiaodong Xu
Author:
Vladimir Fal'ko
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