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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Detalles Bibliográficos
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:
Article
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
Descripción
Sumario: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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