Large Biaxial Compressive Strain Tuning of Neutral and Charged Excitons in Single-Layer Transition Metal Dichalcogenides
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Title: | Large Biaxial Compressive Strain Tuning of Neutral and Charged Excitons in Single-Layer Transition Metal Dichalcogenides |
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Authors: | Henríquez-Guerra, Eudomar | Li, Hao | Pasqués-Gramage, Pablo | Gosálbez-Martínez, Daniel | D’Agosta, Roberto | Castellanos-Gomez, Andres | Calvo, M. Reyes |
Research Group/s: | Física de la Materia Condensada | Grupo de Nanofísica |
Center, Department or Service: | Universidad de Alicante. Departamento de Física Aplicada | Universidad de Alicante. Instituto Universitario de Materiales |
Keywords: | 2D materials | Transition metal dichalcogenides | Biaxial compressive strain | Micro-reflectance spectroscopy | Differential reflectance | Excitons | Trions | Binding energy |
Issue Date: | 30-Nov-2023 |
Publisher: | American Chemical Society |
Citation: | ACS Applied Materials & Interfaces. 2023, 15(49): 57369-57378. https://doi.org/10.1021/acsami.3c13281 |
Abstract: | The absorption and emission of light in single-layer transition metal dichalcogenides are governed by the formation of excitonic quasiparticles. Strain provides a powerful technique to tune the optoelectronic properties of two-dimensional materials and thus to adjust their exciton energies. The effects of large compressive strain in the optical spectrum of two-dimensional (2D) semiconductors remain rather unexplored compared to those of tensile strain, mainly due to experimental constraints. Here, we induced large, uniform, biaxial compressive strain (∼1.2%) by cooling, down to 10 K, single-layer WS2, MoS2, WSe2, and MoSe2 deposited on polycarbonate substrates. We observed a significant strain-induced modulation of neutral exciton energies, with blue shifts up to 160 meV, larger than in any previous experiments. Our results indicate a remarkably efficient transfer of compressive strain, demonstrated by gauge factor values exceeding previous results and approaching theoretical expectations. At low temperatures, we investigated the effect of compressive strain on the resonances associated with the formation of charged excitons. In WS2, a notable reduction of gauge factors for charged compared to neutral excitons suggests an increase in their binding energy, which likely results from the effects of strain added to the influence of the polymeric substrate. |
Sponsor: | The authors acknowledge funding from the Generalitat Valenciana through grants IDIFEDER/2020/005 and IDIFEDER/2021/016 and support from the Plan Gen-T of Excellence for M.R.C (CideGenT2018004) and from the Spanish MCINN through grants PLASTOP PID2020-119124RB-I00, TED2021-131641B-C43, PID2020-115566RB-I00, TED2021-132267B-I00, and PID2020-112811GB-I00. This work was funded by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement no. 755655, ERC-StG 2017 project 2D-TOPSENSE). The authors also acknowledge funding from the EU FLAG-ERA project To2Dox (JTC-2019-009) and the Comunidad de Madrid through the CAIRO-CM project (Y2020/NMT-6661). H.L. acknowledges support from China Scholarship Council (CSC) under grant no. 201907040070. D.G.-M. thanks the Maria Zambrano Program at the University of Alicante founded by the European Union-Next Generation EU. R.D’A. acknowledges support from the Grant No. IT1453- 22 “Grupos Consolidados UPV/EHU del Gobierno Vasco”. |
URI: | http://hdl.handle.net/10045/138879 |
ISSN: | 1944-8244 (Print) | 1944-8252 (Online) |
DOI: | 10.1021/acsami.3c13281 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2023 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0. |
Peer Review: | si |
Publisher version: | https://doi.org/10.1021/acsami.3c13281 |
Appears in Collections: | INV - Grupo de Nanofísica - Artículos de Revistas Research funded by the EU INV - Física de la Materia Condensada - Artículos de Revistas |
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Henriquez-Guerra_etal_2023_ACSApplMaterInterfaces.pdf | 6,77 MB | Adobe PDF | Open Preview | |
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