Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation

Steffi Y. Woo; Fuhui Shao; Ashish Arora; Robert Schneider; Nianjheng Wu; Andrew J. Mayne; Ching Hwa Ho; Mauro Och; Cecilia Mattevi; Antoine Reserbat-Plantey; Álvaro Moreno; Hanan Herzig Sheinfux; Kenji Watanabe; Takashi Taniguchi; Steffen Michaelis de Vasconcellos; Frank H.L. Koppens; Zhichuan Niu; Odile Stéphan; Mathieu Kociak; F. Javier García de Abajo; Rudolf Bratschitsch; Andrea Konečná; Luiz H.G. Tizei

doi:10.1021/acs.nanolett.3c05063

Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation

Steffi Y. Woo, Fuhui Shao, Ashish Arora, Robert Schneider, Nianjheng Wu, Andrew J. Mayne, Ching Hwa Ho, Mauro Och, Cecilia Mattevi, Antoine Reserbat-Plantey, Álvaro Moreno, Hanan Herzig Sheinfux, Kenji Watanabe, Takashi Taniguchi, Steffen Michaelis de Vasconcellos, Frank H.L. Koppens, Zhichuan Niu, Odile Stéphan, Mathieu Kociak, F. Javier García de AbajoRudolf Bratschitsch, Andrea Konečná, Luiz H.G. Tizei

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic applications. Here, the near-field coupling between TMDs and graphene/graphite is used to engineer the exciton line shape and charge state. Fano-like asymmetric spectral features are produced in WS₂, MoSe₂, and WSe₂ van der Waals heterostructures combined with graphene, graphite, or jointly with hexagonal boron nitride (h-BN) as supporting or encapsulating layers. Furthermore, trion emission is suppressed in h-BN encapsulated WSe₂/graphene with a neutral exciton red shift (44 meV) and binding energy reduction (30 meV). The response of these systems to electron beam and light probes is well-described in terms of 2D optical conductivities of the involved materials. Beyond fundamental insights into the interaction of TMD excitons with structured environments, this study opens an unexplored avenue toward shaping the spectral profile of narrow optical modes for application in nanophotonic devices.

Original language	English
Pages (from-to)	3678-3685
Number of pages	8
Journal	Nano Letters
Volume	24
Issue number	12
DOIs	https://doi.org/10.1021/acs.nanolett.3c05063
State	Published - Mar 27 2024
Externally published	Yes

Funding

This project has been funded in part by the National Agency for Research under the program of future investment TEMPOS-CHROMATEM (reference no. ANR-10-EQPX-50) and the JCJC grant SpinE (reference no. ANR-20-CE42-0020). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 823717 (ESTEEM3) and 101017720 (EBEAM). A.K. acknowledges the support of the Czech Science Foundation GACR under the Junior Star grant No. 23-05119M. A.A. acknowledges financial support from the German Research Foundation (DFG Projects No. AR 1128/1-1 and No. AR 1128/1-2), NM-ICPS of the DST (Government of India) through the I-HUB Quantum Technology Foundation (Pune, India), Project No. CRG/2022/007008 of SERB (Government of India), and MoE-STARS project No. MoE-STARS/STARS-2/2023-0912 (Government of India). N.W. thanks the MAGMA project for funding (ANR-16-MAGMA-0027). C.M. acknowledges the award of a Royal Society University Research Fellowship (UF160539) and the Research Fellow Enhancement Award 2017 (RGF - 180090) by the Royal Society UK. K.W. and T.T. acknowledge support from the JSPS KAKENHI (Grant Numbers 21H05233 and 23H02052) and World Premier International Research Center Initiative (WPI), MEXT, Japan. F.H.L.K, A.M., and A.R.-P. acknowledge BIST Ignite Programme grant from the Barcelona Institute of Science and Technology (QEE2DUP). F.J.G.A. acknowledges support from the European Research Council (Advanced Grant No. 789104-eNANO) and the Spanish MICINN (PID2020-112625 GB-I00 and Severo Ochoa CEX2019-000910-S). S.Y.W. acknowledges Dr. Joseph G. Manion for the Blender assets and tutorials.

Keywords

electron energy-loss spectroscopy
excitons
transition metal dichalcogenides
two-dimensional materials
van der Waals heterostructure

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10.1021/acs.nanolett.3c05063

Cite this

Woo, S. Y., Shao, F., Arora, A., Schneider, R., Wu, N., Mayne, A. J., Ho, C. H., Och, M., Mattevi, C., Reserbat-Plantey, A., Moreno, Á., Sheinfux, H. H., Watanabe, K., Taniguchi, T., Michaelis de Vasconcellos, S., Koppens, F. H. L., Niu, Z., Stéphan, O., Kociak, M., ... Tizei, L. H. G. (2024). Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation. Nano Letters, 24(12), 3678-3685. https://doi.org/10.1021/acs.nanolett.3c05063

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title = "Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation",

abstract = "Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic applications. Here, the near-field coupling between TMDs and graphene/graphite is used to engineer the exciton line shape and charge state. Fano-like asymmetric spectral features are produced in WS2, MoSe2, and WSe2 van der Waals heterostructures combined with graphene, graphite, or jointly with hexagonal boron nitride (h-BN) as supporting or encapsulating layers. Furthermore, trion emission is suppressed in h-BN encapsulated WSe2/graphene with a neutral exciton red shift (44 meV) and binding energy reduction (30 meV). The response of these systems to electron beam and light probes is well-described in terms of 2D optical conductivities of the involved materials. Beyond fundamental insights into the interaction of TMD excitons with structured environments, this study opens an unexplored avenue toward shaping the spectral profile of narrow optical modes for application in nanophotonic devices.",

keywords = "electron energy-loss spectroscopy, excitons, transition metal dichalcogenides, two-dimensional materials, van der Waals heterostructure",

author = "Woo, {Steffi Y.} and Fuhui Shao and Ashish Arora and Robert Schneider and Nianjheng Wu and Mayne, {Andrew J.} and Ho, {Ching Hwa} and Mauro Och and Cecilia Mattevi and Antoine Reserbat-Plantey and {\'A}lvaro Moreno and Sheinfux, {Hanan Herzig} and Kenji Watanabe and Takashi Taniguchi and {Michaelis de Vasconcellos}, Steffen and Koppens, {Frank H.L.} and Zhichuan Niu and Odile St{\'e}phan and Mathieu Kociak and {Garc{\'i}a de Abajo}, {F. Javier} and Rudolf Bratschitsch and Andrea Kone{\v c}n{\'a} and Tizei, {Luiz H.G.}",

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year = "2024",

month = mar,

day = "27",

doi = "10.1021/acs.nanolett.3c05063",

language = "English",

volume = "24",

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Woo, SY, Shao, F, Arora, A, Schneider, R, Wu, N, Mayne, AJ, Ho, CH, Och, M, Mattevi, C, Reserbat-Plantey, A, Moreno, Á, Sheinfux, HH, Watanabe, K, Taniguchi, T, Michaelis de Vasconcellos, S, Koppens, FHL, Niu, Z, Stéphan, O, Kociak, M, García de Abajo, FJ, Bratschitsch, R, Konečná, A & Tizei, LHG 2024, 'Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation', Nano Letters, vol. 24, no. 12, pp. 3678-3685. https://doi.org/10.1021/acs.nanolett.3c05063

TY - JOUR

T1 - Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation

AU - Woo, Steffi Y.

AU - Shao, Fuhui

AU - Arora, Ashish

AU - Schneider, Robert

AU - Wu, Nianjheng

AU - Mayne, Andrew J.

AU - Ho, Ching Hwa

AU - Och, Mauro

AU - Mattevi, Cecilia

AU - Reserbat-Plantey, Antoine

AU - Moreno, Álvaro

AU - Sheinfux, Hanan Herzig

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Michaelis de Vasconcellos, Steffen

AU - Koppens, Frank H.L.

AU - Niu, Zhichuan

AU - Stéphan, Odile

AU - Kociak, Mathieu

AU - García de Abajo, F. Javier

AU - Bratschitsch, Rudolf

AU - Konečná, Andrea

AU - Tizei, Luiz H.G.

PY - 2024/3/27

Y1 - 2024/3/27

N2 - Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic applications. Here, the near-field coupling between TMDs and graphene/graphite is used to engineer the exciton line shape and charge state. Fano-like asymmetric spectral features are produced in WS2, MoSe2, and WSe2 van der Waals heterostructures combined with graphene, graphite, or jointly with hexagonal boron nitride (h-BN) as supporting or encapsulating layers. Furthermore, trion emission is suppressed in h-BN encapsulated WSe2/graphene with a neutral exciton red shift (44 meV) and binding energy reduction (30 meV). The response of these systems to electron beam and light probes is well-described in terms of 2D optical conductivities of the involved materials. Beyond fundamental insights into the interaction of TMD excitons with structured environments, this study opens an unexplored avenue toward shaping the spectral profile of narrow optical modes for application in nanophotonic devices.

AB - Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic applications. Here, the near-field coupling between TMDs and graphene/graphite is used to engineer the exciton line shape and charge state. Fano-like asymmetric spectral features are produced in WS2, MoSe2, and WSe2 van der Waals heterostructures combined with graphene, graphite, or jointly with hexagonal boron nitride (h-BN) as supporting or encapsulating layers. Furthermore, trion emission is suppressed in h-BN encapsulated WSe2/graphene with a neutral exciton red shift (44 meV) and binding energy reduction (30 meV). The response of these systems to electron beam and light probes is well-described in terms of 2D optical conductivities of the involved materials. Beyond fundamental insights into the interaction of TMD excitons with structured environments, this study opens an unexplored avenue toward shaping the spectral profile of narrow optical modes for application in nanophotonic devices.

KW - electron energy-loss spectroscopy

KW - excitons

KW - transition metal dichalcogenides

KW - two-dimensional materials

KW - van der Waals heterostructure

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DO - 10.1021/acs.nanolett.3c05063

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SN - 1530-6984

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EP - 3685

JO - Nano Letters

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ER -

Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation

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Keywords

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