Article Nb impurity-bound excitons as quantum emitters in monolayer WS2

Leyi Loh ORCID ; Yi Wei Ho ORCID ; Fengyuan Xuan ORCID ; Andrés Granados del Águila ; Yuan Chen ORCID ; See Yoong Wong ; Jingda Zhang ; Zhe Wang ORCID ; Kenji Watanabe SAMURAI ORCID ; Takashi Taniguchi SAMURAI ORCID ; Paul J. Pigram ORCID ; Michel Bosman ; Su Ying Quek ORCID ; Maciej Koperski ORCID ; Goki Eda ORCID

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Leyi Loh, Yi Wei Ho, Fengyuan Xuan, Andrés Granados del Águila, Yuan Chen, See Yoong Wong, Jingda Zhang, Zhe Wang, Kenji Watanabe, Takashi Taniguchi, Paul J. Pigram, Michel Bosman, Su Ying Quek, Maciej Koperski, Goki Eda. Nb impurity-bound excitons as quantum emitters in monolayer WS2. Nature Communications. 2024, 15 (1), 10035. https://doi.org/10.1038/s41467-024-54360-5

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(abstract)

Point defects in crystalline solids behave as optically addressable individual quantum systems when present in sufficiently low concentrations. In two-dimensional semiconductors, such quantum defects hold potential as versatile single photon sources. Here, we report the synthesis and optical properties of impurity-doped monolayer WS2 in the dilute limit where the average spacing between individual dopants exceeds the optical diffraction limit. We show that these individual dopants exhibit common features of quantum emitters, including narrow emission lines (with linewidths <1 meV), strong spatial confinement, and photon antibunching. These emitters consistently occur within a narrow spectral range across multiple samples, distinct from common quantum emitters in van der Waals materials that show large ensemble broadening. Analysis of the Zeeman splitting reveals that they can be attributed to bound exciton complexes comprising dark excitons and negatively charged Nb.

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Keyword: Point defects, quantum systems, single photon sources

Date published: 2024-11-20

Publisher: Springer Science and Business Media LLC

Journal:

  • Nature Communications (ISSN: 20411723) vol. 15 issue. 1 10035

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41467-024-54360-5

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Updated at: 2025-02-06 12:30:31 +0900

Published on MDR: 2025-02-06 12:30:31 +0900

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