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Bandgap renormalization in single-wall carbon nanotubes

Single-wall carbon nanotubes (SWNTs) have been extensively explored as an ultrafast nonlinear optical material. However, due to the numerous electronic and morphological arrangements, a simple and self-contained physical model that can unambiguously account for the rich photocarrier dynamics in SWNT...

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Autores principales: Zhu, Chunhui, Liu, Yujie, Xu, Jieying, Nie, Zhonghui, Li, Yao, Xu, Yongbing, Zhang, Rong, Wang, Fengqiu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5593862/
https://www.ncbi.nlm.nih.gov/pubmed/28894285
http://dx.doi.org/10.1038/s41598-017-11767-z
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author Zhu, Chunhui
Liu, Yujie
Xu, Jieying
Nie, Zhonghui
Li, Yao
Xu, Yongbing
Zhang, Rong
Wang, Fengqiu
author_facet Zhu, Chunhui
Liu, Yujie
Xu, Jieying
Nie, Zhonghui
Li, Yao
Xu, Yongbing
Zhang, Rong
Wang, Fengqiu
author_sort Zhu, Chunhui
collection PubMed
description Single-wall carbon nanotubes (SWNTs) have been extensively explored as an ultrafast nonlinear optical material. However, due to the numerous electronic and morphological arrangements, a simple and self-contained physical model that can unambiguously account for the rich photocarrier dynamics in SWNTs is still absent. Here, by performing broadband degenerate and non-degenerate pump-probe experiments on SWNTs of different chiralities and morphologies, we reveal strong evidences for the existence of bandgap renormalization in SWNTs. In particularly, it is found that the broadband transient response of SWNTs can be well explained by the combined effects of Pauli blocking and bandgap renormalization, and the distinct dynamics is further influenced by the different sensitivity of degenerate and non-degenerate measurements to these two concurrent effects. Furthermore, we attribute optical-phonon bath thermalization as an underlying mechanism for the observed bandgap renormalization. Our findings provide new guidelines for interpreting the broadband optical response of carbon nanotubes.
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spelling pubmed-55938622017-09-13 Bandgap renormalization in single-wall carbon nanotubes Zhu, Chunhui Liu, Yujie Xu, Jieying Nie, Zhonghui Li, Yao Xu, Yongbing Zhang, Rong Wang, Fengqiu Sci Rep Article Single-wall carbon nanotubes (SWNTs) have been extensively explored as an ultrafast nonlinear optical material. However, due to the numerous electronic and morphological arrangements, a simple and self-contained physical model that can unambiguously account for the rich photocarrier dynamics in SWNTs is still absent. Here, by performing broadband degenerate and non-degenerate pump-probe experiments on SWNTs of different chiralities and morphologies, we reveal strong evidences for the existence of bandgap renormalization in SWNTs. In particularly, it is found that the broadband transient response of SWNTs can be well explained by the combined effects of Pauli blocking and bandgap renormalization, and the distinct dynamics is further influenced by the different sensitivity of degenerate and non-degenerate measurements to these two concurrent effects. Furthermore, we attribute optical-phonon bath thermalization as an underlying mechanism for the observed bandgap renormalization. Our findings provide new guidelines for interpreting the broadband optical response of carbon nanotubes. Nature Publishing Group UK 2017-09-11 /pmc/articles/PMC5593862/ /pubmed/28894285 http://dx.doi.org/10.1038/s41598-017-11767-z Text en © The Author(s) 2017 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/.
spellingShingle Article
Zhu, Chunhui
Liu, Yujie
Xu, Jieying
Nie, Zhonghui
Li, Yao
Xu, Yongbing
Zhang, Rong
Wang, Fengqiu
Bandgap renormalization in single-wall carbon nanotubes
title Bandgap renormalization in single-wall carbon nanotubes
title_full Bandgap renormalization in single-wall carbon nanotubes
title_fullStr Bandgap renormalization in single-wall carbon nanotubes
title_full_unstemmed Bandgap renormalization in single-wall carbon nanotubes
title_short Bandgap renormalization in single-wall carbon nanotubes
title_sort bandgap renormalization in single-wall carbon nanotubes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5593862/
https://www.ncbi.nlm.nih.gov/pubmed/28894285
http://dx.doi.org/10.1038/s41598-017-11767-z
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