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Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices

Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moiré potential and Coulomb interactions. The moiré superlattices act as a periodic confinement pote...

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Autores principales: Wu, Biao, Zheng, Haihong, Li, Shaofei, Ding, Junnan, He, Jun, Zeng, Yujia, Chen, Keqiu, Liu, Zongwen, Chen, Shula, Pan, Anlian, Liu, Yanping
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9160078/
https://www.ncbi.nlm.nih.gov/pubmed/35650176
http://dx.doi.org/10.1038/s41377-022-00854-0
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author Wu, Biao
Zheng, Haihong
Li, Shaofei
Ding, Junnan
He, Jun
Zeng, Yujia
Chen, Keqiu
Liu, Zongwen
Chen, Shula
Pan, Anlian
Liu, Yanping
author_facet Wu, Biao
Zheng, Haihong
Li, Shaofei
Ding, Junnan
He, Jun
Zeng, Yujia
Chen, Keqiu
Liu, Zongwen
Chen, Shula
Pan, Anlian
Liu, Yanping
author_sort Wu, Biao
collection PubMed
description Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moiré potential and Coulomb interactions. The moiré superlattices act as a periodic confinement potential in space to capture interlayer excitons (IXs), resulting in moiré exciton arrays, which provide opportunities for quantum emitters and many-body physics. The observation of moiré IXs in twisted transition-metal dichalcogenide (TMD) heterostructures has recently been widely reported. However, the capture and study of the moiré intralayer excitons based on TMD twisted homobilayer (T-HB) remain elusive. Here, we report the observation of moiré intralayer excitons in a WSe(2)/WSe(2) T-HB with a small twist angle by measuring PL spectrum. The multiple split peaks with an energy range of 1.55–1.73 eV are different from that of the monolayer WSe(2) exciton peaks. The split peaks were caused by the trapping of intralayer excitons via the moiré potential. The confinement effect of the moiré potential on the moiré intralayer excitons was further demonstrated by the changing of temperature, laser power, and valley polarization. Our findings provide a new avenue for exploring new correlated quantum phenomena and their applications.
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spelling pubmed-91600782022-06-03 Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices Wu, Biao Zheng, Haihong Li, Shaofei Ding, Junnan He, Jun Zeng, Yujia Chen, Keqiu Liu, Zongwen Chen, Shula Pan, Anlian Liu, Yanping Light Sci Appl Article Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moiré potential and Coulomb interactions. The moiré superlattices act as a periodic confinement potential in space to capture interlayer excitons (IXs), resulting in moiré exciton arrays, which provide opportunities for quantum emitters and many-body physics. The observation of moiré IXs in twisted transition-metal dichalcogenide (TMD) heterostructures has recently been widely reported. However, the capture and study of the moiré intralayer excitons based on TMD twisted homobilayer (T-HB) remain elusive. Here, we report the observation of moiré intralayer excitons in a WSe(2)/WSe(2) T-HB with a small twist angle by measuring PL spectrum. The multiple split peaks with an energy range of 1.55–1.73 eV are different from that of the monolayer WSe(2) exciton peaks. The split peaks were caused by the trapping of intralayer excitons via the moiré potential. The confinement effect of the moiré potential on the moiré intralayer excitons was further demonstrated by the changing of temperature, laser power, and valley polarization. Our findings provide a new avenue for exploring new correlated quantum phenomena and their applications. Nature Publishing Group UK 2022-06-01 /pmc/articles/PMC9160078/ /pubmed/35650176 http://dx.doi.org/10.1038/s41377-022-00854-0 Text en © The Author(s) 2022 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
Wu, Biao
Zheng, Haihong
Li, Shaofei
Ding, Junnan
He, Jun
Zeng, Yujia
Chen, Keqiu
Liu, Zongwen
Chen, Shula
Pan, Anlian
Liu, Yanping
Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices
title Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices
title_full Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices
title_fullStr Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices
title_full_unstemmed Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices
title_short Evidence for moiré intralayer excitons in twisted WSe(2)/WSe(2) homobilayer superlattices
title_sort evidence for moiré intralayer excitons in twisted wse(2)/wse(2) homobilayer superlattices
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9160078/
https://www.ncbi.nlm.nih.gov/pubmed/35650176
http://dx.doi.org/10.1038/s41377-022-00854-0
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