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High degree of circular polarization in WS₂ spiral nanostructures induced by broken symmetry.

ABSTRACT: We present helicity resolved photoluminescence (PL) measurements of WS₂ 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 WS₂ samples, along with polarization resolved PL studies provide evidence for suppression of interlayer/intravalley scattering in the multilayer SPI samples.

SUBMITTER: Barman PK

PROVIDER: S-EPMC6391472 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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High degree of circular polarization in WS2 spiral nanostructures induced by broken symmetry.

Barman Prahalad Kanti PK Sarma Prasad V PV Shaijumon M M MM Kini R N RN

Scientific reports 20190226 1

We present helicity resolved photoluminescence (PL) measurements of WS2 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 ...[more]

PMID: 30808931

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