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Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers

Van der Waals heterobilayers of transition metal dichalcogenides with spin–valley coupling of carriers in different layers have emerged as a new platform for exploring spin/valleytronic applications. The interlayer coupling was predicted to exhibit subtle changes with the interlayer atomic registry....

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Autores principales: Hsu, Wei-Ting, Lu, Li-Syuan, Wu, Po-Hsun, Lee, Ming-Hao, Chen, Peng-Jen, Wu, Pei-Ying, Chou, Yi-Chia, Jeng, Horng-Tay, Li, Lain-Jong, Chu, Ming-Wen, Chang, Wen-Hao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5893569/
https://www.ncbi.nlm.nih.gov/pubmed/29636479
http://dx.doi.org/10.1038/s41467-018-03869-7
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author Hsu, Wei-Ting
Lu, Li-Syuan
Wu, Po-Hsun
Lee, Ming-Hao
Chen, Peng-Jen
Wu, Pei-Ying
Chou, Yi-Chia
Jeng, Horng-Tay
Li, Lain-Jong
Chu, Ming-Wen
Chang, Wen-Hao
author_facet Hsu, Wei-Ting
Lu, Li-Syuan
Wu, Po-Hsun
Lee, Ming-Hao
Chen, Peng-Jen
Wu, Pei-Ying
Chou, Yi-Chia
Jeng, Horng-Tay
Li, Lain-Jong
Chu, Ming-Wen
Chang, Wen-Hao
author_sort Hsu, Wei-Ting
collection PubMed
description Van der Waals heterobilayers of transition metal dichalcogenides with spin–valley coupling of carriers in different layers have emerged as a new platform for exploring spin/valleytronic applications. The interlayer coupling was predicted to exhibit subtle changes with the interlayer atomic registry. Manually stacked heterobilayers, however, are incommensurate with the inevitable interlayer twist and/or lattice mismatch, where the properties associated with atomic registry are difficult to access by optical means. Here, we unveil the distinct polarization properties of valley-specific interlayer excitons using epitaxially grown, commensurate WSe(2)/MoSe(2) heterobilayers with well-defined (AA and AB) atomic registry. We observe circularly polarized photoluminescence from interlayer excitons, but with a helicity opposite to the optical excitation. The negative circular polarization arises from the quantum interference imposed by interlayer atomic registry, giving rise to distinct polarization selection rules for interlayer excitons. Using selective excitation schemes, we demonstrate the optical addressability for interlayer excitons with different valley configurations and polarization helicities.
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spelling pubmed-58935692018-04-13 Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers Hsu, Wei-Ting Lu, Li-Syuan Wu, Po-Hsun Lee, Ming-Hao Chen, Peng-Jen Wu, Pei-Ying Chou, Yi-Chia Jeng, Horng-Tay Li, Lain-Jong Chu, Ming-Wen Chang, Wen-Hao Nat Commun Article Van der Waals heterobilayers of transition metal dichalcogenides with spin–valley coupling of carriers in different layers have emerged as a new platform for exploring spin/valleytronic applications. The interlayer coupling was predicted to exhibit subtle changes with the interlayer atomic registry. Manually stacked heterobilayers, however, are incommensurate with the inevitable interlayer twist and/or lattice mismatch, where the properties associated with atomic registry are difficult to access by optical means. Here, we unveil the distinct polarization properties of valley-specific interlayer excitons using epitaxially grown, commensurate WSe(2)/MoSe(2) heterobilayers with well-defined (AA and AB) atomic registry. We observe circularly polarized photoluminescence from interlayer excitons, but with a helicity opposite to the optical excitation. The negative circular polarization arises from the quantum interference imposed by interlayer atomic registry, giving rise to distinct polarization selection rules for interlayer excitons. Using selective excitation schemes, we demonstrate the optical addressability for interlayer excitons with different valley configurations and polarization helicities. Nature Publishing Group UK 2018-04-10 /pmc/articles/PMC5893569/ /pubmed/29636479 http://dx.doi.org/10.1038/s41467-018-03869-7 Text en © The Author(s) 2018 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
Hsu, Wei-Ting
Lu, Li-Syuan
Wu, Po-Hsun
Lee, Ming-Hao
Chen, Peng-Jen
Wu, Pei-Ying
Chou, Yi-Chia
Jeng, Horng-Tay
Li, Lain-Jong
Chu, Ming-Wen
Chang, Wen-Hao
Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers
title Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers
title_full Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers
title_fullStr Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers
title_full_unstemmed Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers
title_short Negative circular polarization emissions from WSe(2)/MoSe(2) commensurate heterobilayers
title_sort negative circular polarization emissions from wse(2)/mose(2) commensurate heterobilayers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5893569/
https://www.ncbi.nlm.nih.gov/pubmed/29636479
http://dx.doi.org/10.1038/s41467-018-03869-7
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