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Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit
Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing applications. However, most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities, as there are la...
Autores principales: | , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7338549/ https://www.ncbi.nlm.nih.gov/pubmed/32655861 http://dx.doi.org/10.1038/s41377-020-00347-y |
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author | Sharma, Ankur Zhang, Linglong Tollerud, Jonathan O. Dong, Miheng Zhu, Yi Halbich, Robert Vogl, Tobias Liang, Kun Nguyen, Hieu T. Wang, Fan Sanwlani, Shilpa Earl, Stuart K. Macdonald, Daniel Lam, Ping Koy Davis, Jeffrey A. Lu, Yuerui |
author_facet | Sharma, Ankur Zhang, Linglong Tollerud, Jonathan O. Dong, Miheng Zhu, Yi Halbich, Robert Vogl, Tobias Liang, Kun Nguyen, Hieu T. Wang, Fan Sanwlani, Shilpa Earl, Stuart K. Macdonald, Daniel Lam, Ping Koy Davis, Jeffrey A. Lu, Yuerui |
author_sort | Sharma, Ankur |
collection | PubMed |
description | Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing applications. However, most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities, as there are large inhomogeneous broadening and dephasing effects on the transport of excitons in their native states in materials. Here, by confining coherent excitons at the 2D quantum limit, we first observed molecular aggregation-enabled ‘supertransport’ of excitons in atomically thin two-dimensional (2D) organic semiconductors between coherent states, with a measured high effective exciton diffusion coefficient of ~346.9 cm(2)/s at room temperature. This value is one to several orders of magnitude higher than the values reported for other organic molecular aggregates and low-dimensional inorganic materials. Without coupling to any optical cavities, the monolayer pentacene sample, a very clean 2D quantum system (~1.2 nm thick) with high crystallinity (J-type aggregation) and minimal interfacial states, showed superradiant emission from Frenkel excitons, which was experimentally confirmed by the temperature-dependent photoluminescence (PL) emission, highly enhanced radiative decay rate, significantly narrowed PL peak width and strongly directional in-plane emission. The coherence in monolayer pentacene samples was observed to be delocalised over ~135 molecules, which is significantly larger than the values (a few molecules) observed for other organic thin films. In addition, the supertransport of excitons in monolayer pentacene samples showed highly anisotropic behaviour. Our results pave the way for the development of future high-speed excitonic circuits, fast OLEDs, and other optoelectronic devices. |
format | Online Article Text |
id | pubmed-7338549 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-73385492020-07-09 Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit Sharma, Ankur Zhang, Linglong Tollerud, Jonathan O. Dong, Miheng Zhu, Yi Halbich, Robert Vogl, Tobias Liang, Kun Nguyen, Hieu T. Wang, Fan Sanwlani, Shilpa Earl, Stuart K. Macdonald, Daniel Lam, Ping Koy Davis, Jeffrey A. Lu, Yuerui Light Sci Appl Article Long-range and fast transport of coherent excitons is important for the development of high-speed excitonic circuits and quantum computing applications. However, most of these coherent excitons have only been observed in some low-dimensional semiconductors when coupled with cavities, as there are large inhomogeneous broadening and dephasing effects on the transport of excitons in their native states in materials. Here, by confining coherent excitons at the 2D quantum limit, we first observed molecular aggregation-enabled ‘supertransport’ of excitons in atomically thin two-dimensional (2D) organic semiconductors between coherent states, with a measured high effective exciton diffusion coefficient of ~346.9 cm(2)/s at room temperature. This value is one to several orders of magnitude higher than the values reported for other organic molecular aggregates and low-dimensional inorganic materials. Without coupling to any optical cavities, the monolayer pentacene sample, a very clean 2D quantum system (~1.2 nm thick) with high crystallinity (J-type aggregation) and minimal interfacial states, showed superradiant emission from Frenkel excitons, which was experimentally confirmed by the temperature-dependent photoluminescence (PL) emission, highly enhanced radiative decay rate, significantly narrowed PL peak width and strongly directional in-plane emission. The coherence in monolayer pentacene samples was observed to be delocalised over ~135 molecules, which is significantly larger than the values (a few molecules) observed for other organic thin films. In addition, the supertransport of excitons in monolayer pentacene samples showed highly anisotropic behaviour. Our results pave the way for the development of future high-speed excitonic circuits, fast OLEDs, and other optoelectronic devices. Nature Publishing Group UK 2020-07-06 /pmc/articles/PMC7338549/ /pubmed/32655861 http://dx.doi.org/10.1038/s41377-020-00347-y Text en © The Author(s) 2020 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Sharma, Ankur Zhang, Linglong Tollerud, Jonathan O. Dong, Miheng Zhu, Yi Halbich, Robert Vogl, Tobias Liang, Kun Nguyen, Hieu T. Wang, Fan Sanwlani, Shilpa Earl, Stuart K. Macdonald, Daniel Lam, Ping Koy Davis, Jeffrey A. Lu, Yuerui Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit |
title | Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit |
title_full | Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit |
title_fullStr | Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit |
title_full_unstemmed | Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit |
title_short | Supertransport of excitons in atomically thin organic semiconductors at the 2D quantum limit |
title_sort | supertransport of excitons in atomically thin organic semiconductors at the 2d quantum limit |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7338549/ https://www.ncbi.nlm.nih.gov/pubmed/32655861 http://dx.doi.org/10.1038/s41377-020-00347-y |
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