Impact of substrates and quantum effects on exciton line shapes of 2D semiconductors at room temperature
Author:
van de Groep Jorik12ORCID, Li Qitong1, Song Jung-Hwan1, Kik Pieter G.3, Brongersma Mark L.1ORCID
Affiliation:
1. Geballe Laboratory for Advanced Materials , Stanford University , Stanford , USA 2. Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam , Amsterdam , The Netherlands 3. CREOL, The College of Optics and Photonics , University of Central Florida , Orlando , USA
Abstract
Abstract
Exciton resonances in monolayer transition-metal dichalcogenides (TMDs) provide exceptionally strong light–matter interaction at room temperature. Their spectral line shape is critical in the design of a myriad of optoelectronic devices, ranging from solar cells to quantum information processing. However, disorder resulting from static inhomogeneities and dynamical fluctuations can significantly impact the line shape. Many recent works experimentally evaluate the optical properties of TMD monolayers placed on a substrate and the line shape is typically linked directly to the material’s quality. Here, we highlight that the interference of the substrate and TMD reflections can strongly influence the line shape. We further show how basic, room-temperature reflection measurements allow investigation of the quantum mechanical exciton dynamics by systematically controlling the substrate reflection with index-matching oils. By removing the substrate contribution with properly chosen oil, we can extract the excitonic decay rates including the quantum mechanical dephasing rate. The results provide valuable guidance for the engineering of exciton line shapes in layered nanophotonic systems.
Funder
DOE Energy Frontier Research Center National Science Foundation National Research Foundation of Korea Dutch Science Foundation US Air Force
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
Reference44 articles.
1. B. Radisavljevic, A. Radenovic, J. Brivio, V. Giacometti, and A. Kis, “Single-layer MoS2 transistors,” Nat. Nanotechnol., vol. 6, no. 3, pp. 147–150, 2011. https://doi.org/10.1038/nnano.2010.279. 2. A. Daus, S. Vaziri, V. Chen, et al.., “High-performance flexible nanoscale transistors based on transition metal dichalcogenides,” Nat. Electron., vol. 4, no. 7, pp. 495–501, 2021. https://doi.org/10.1038/s41928-021-00598-6. 3. Z. Yin, H. Li, H. Li, et al.., “Single-layer MoS2 phototransistors,” ACS Nano, vol. 6, no. 1, pp. 74–80, 2012. https://doi.org/10.1021/nn2024557. 4. O. Lopez-Sanchez, D. Lembke, M. Kayci, A. Radenovic, and A. Kis, “Ultrasensitive photodetectors based on monolayer MoS2,” Nat. Nanotechnol., vol. 8, no. 7, pp. 497–501, 2013. https://doi.org/10.1038/nnano.2013.100. 5. K. N. Nazif, A. Daus, J. Hong, et al.., “High-specific-power flexible transition metal dichalcogenide solar cells,” Nat. Commun., vol. 12, no. 1, pp. 1–9, 2021.
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|