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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
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.
Resonance Raman Spectroscopy, 2D materials, van der Waals materials
2053-1583
Mcdonnell, Liam
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Viner, Jacob
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Ruiz-Tijerina, David
bd7e7b38-4dcd-4191-98f1-fca5173ef7e5
Rivera, Pasqual
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Xu, Xiaodong
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Fal'ko, Vladimir
2bcc7a4b-d57c-4bd4-8516-15f82727f5e4
Smith, David
d9b2c02d-b7ea-498b-9ea1-208a1681536f
Mcdonnell, Liam
f2c05544-d580-4f52-bdec-1d74be0697d7
Viner, Jacob
0fe62a03-a774-43d2-a864-79af91de17eb
Ruiz-Tijerina, David
bd7e7b38-4dcd-4191-98f1-fca5173ef7e5
Rivera, Pasqual
8363e6c4-4d7d-4c9e-bf5d-7d08249edf85
Xu, Xiaodong
870f9465-8fb6-42c0-857e-0f834f9a7c96
Fal'ko, Vladimir
2bcc7a4b-d57c-4bd4-8516-15f82727f5e4
Smith, David
d9b2c02d-b7ea-498b-9ea1-208a1681536f

Mcdonnell, Liam, Viner, Jacob, Ruiz-Tijerina, David, Rivera, Pasqual, Xu, Xiaodong, Fal'ko, Vladimir and Smith, David (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).

Record type: Article

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.

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Accepted/In Press date: 18 February 2021
Published date: 25 March 2021
Keywords: Resonance Raman Spectroscopy, 2D materials, van der Waals materials

Identifiers

Local EPrints ID: 448342
URI: http://eprints.soton.ac.uk/id/eprint/448342
ISSN: 2053-1583
PURE UUID: c5b7c887-1a4b-4237-b2ea-248d6a4b6919
ORCID for Liam Mcdonnell: ORCID iD orcid.org/0000-0002-0279-8947

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Date deposited: 20 Apr 2021 16:34
Last modified: 21 Apr 2021 02:03

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Contributors

Author: Liam Mcdonnell ORCID iD
Author: Jacob Viner
Author: David Ruiz-Tijerina
Author: Pasqual Rivera
Author: Xiaodong Xu
Author: Vladimir Fal'ko
Author: David Smith

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