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Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers
The excitonic luminescence of monolayer molybdenum disulfide (MoS(2)) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS(2) is assigned to the radiative decay of A and B excitons. The intensity ratio of A and B exciton emission is modu...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9434384/ https://www.ncbi.nlm.nih.gov/pubmed/36199876 http://dx.doi.org/10.1039/d2ra05123k |
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author | Ma, Yalan Kalt, Romana Alice Stemmer, Andreas |
author_facet | Ma, Yalan Kalt, Romana Alice Stemmer, Andreas |
author_sort | Ma, Yalan |
collection | PubMed |
description | The excitonic luminescence of monolayer molybdenum disulfide (MoS(2)) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS(2) is assigned to the radiative decay of A and B excitons. The intensity ratio of A and B exciton emission is modulated by the tunneling current, since the A exciton emission intensity saturates at high tunneling currents. Moreover, the corrugated gold substrate introduces local strain to the monolayer MoS(2), resulting in significant changes of electronic bandgap and valence band splitting. The modulation rate of strain on A exciton energy is estimated as −69 ± 5 meV/%. STM-LE provides a direct link between exciton energy and local strain in monolayer MoS(2) on a length scale of 10 nm. |
format | Online Article Text |
id | pubmed-9434384 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-94343842022-10-04 Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers Ma, Yalan Kalt, Romana Alice Stemmer, Andreas RSC Adv Chemistry The excitonic luminescence of monolayer molybdenum disulfide (MoS(2)) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS(2) is assigned to the radiative decay of A and B excitons. The intensity ratio of A and B exciton emission is modulated by the tunneling current, since the A exciton emission intensity saturates at high tunneling currents. Moreover, the corrugated gold substrate introduces local strain to the monolayer MoS(2), resulting in significant changes of electronic bandgap and valence band splitting. The modulation rate of strain on A exciton energy is estimated as −69 ± 5 meV/%. STM-LE provides a direct link between exciton energy and local strain in monolayer MoS(2) on a length scale of 10 nm. The Royal Society of Chemistry 2022-09-01 /pmc/articles/PMC9434384/ /pubmed/36199876 http://dx.doi.org/10.1039/d2ra05123k Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Ma, Yalan Kalt, Romana Alice Stemmer, Andreas Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers |
title | Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers |
title_full | Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers |
title_fullStr | Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers |
title_full_unstemmed | Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers |
title_short | Local strain and tunneling current modulate excitonic luminescence in MoS(2) monolayers |
title_sort | local strain and tunneling current modulate excitonic luminescence in mos(2) monolayers |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9434384/ https://www.ncbi.nlm.nih.gov/pubmed/36199876 http://dx.doi.org/10.1039/d2ra05123k |
work_keys_str_mv | AT mayalan localstrainandtunnelingcurrentmodulateexcitonicluminescenceinmos2monolayers AT kaltromanaalice localstrainandtunnelingcurrentmodulateexcitonicluminescenceinmos2monolayers AT stemmerandreas localstrainandtunnelingcurrentmodulateexcitonicluminescenceinmos2monolayers |