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High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry

We present helicity resolved photoluminescence (PL) measurements of WS(2) spiral (SPI) nanostructures. We show that very high degree of circular polarization (DCP) (~94 ± 4%) is obtained from multilayer SPI samples at room temperature upon excitation with a circularly polarized laser at a wavelength...

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Autores principales: Barman, Prahalad Kanti, Sarma, Prasad V., Shaijumon, M. M., Kini, R. N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6391472/
https://www.ncbi.nlm.nih.gov/pubmed/30808931
http://dx.doi.org/10.1038/s41598-019-39246-7
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author Barman, Prahalad Kanti
Sarma, Prasad V.
Shaijumon, M. M.
Kini, R. N.
author_facet Barman, Prahalad Kanti
Sarma, Prasad V.
Shaijumon, M. M.
Kini, R. N.
author_sort Barman, Prahalad Kanti
collection PubMed
description We present helicity resolved photoluminescence (PL) measurements of WS(2) spiral (SPI) nanostructures. We show that very high degree of circular polarization (DCP) (~94 ± 4%) is obtained from multilayer SPI samples at room temperature upon excitation with a circularly polarized laser at a wavelength near-resonant with the A-exciton (633 nm). TEM analysis showed that these SPI nanostructures have AB stacking in which the inversion symmetry is broken, and hence this leads to very high DCP. Comparison with PL from monolayer and bi-layer WS(2) samples, along with polarization resolved PL studies provide evidence for suppression of interlayer/intravalley scattering in the multilayer SPI samples.
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spelling pubmed-63914722019-03-01 High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry Barman, Prahalad Kanti Sarma, Prasad V. Shaijumon, M. M. Kini, R. N. Sci Rep Article We present helicity resolved photoluminescence (PL) measurements of WS(2) spiral (SPI) nanostructures. We show that very high degree of circular polarization (DCP) (~94 ± 4%) is obtained from multilayer SPI samples at room temperature upon excitation with a circularly polarized laser at a wavelength near-resonant with the A-exciton (633 nm). TEM analysis showed that these SPI nanostructures have AB stacking in which the inversion symmetry is broken, and hence this leads to very high DCP. Comparison with PL from monolayer and bi-layer WS(2) samples, along with polarization resolved PL studies provide evidence for suppression of interlayer/intravalley scattering in the multilayer SPI samples. Nature Publishing Group UK 2019-02-26 /pmc/articles/PMC6391472/ /pubmed/30808931 http://dx.doi.org/10.1038/s41598-019-39246-7 Text en © The Author(s) 2019 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
Barman, Prahalad Kanti
Sarma, Prasad V.
Shaijumon, M. M.
Kini, R. N.
High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry
title High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry
title_full High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry
title_fullStr High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry
title_full_unstemmed High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry
title_short High degree of circular polarization in WS(2) spiral nanostructures induced by broken symmetry
title_sort high degree of circular polarization in ws(2) spiral nanostructures induced by broken symmetry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6391472/
https://www.ncbi.nlm.nih.gov/pubmed/30808931
http://dx.doi.org/10.1038/s41598-019-39246-7
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