Salvatore Cianci
;
Elena Blundo
;
Federico Tuzi
;
Giorgio Pettinari
;
Katarzyna Olkowska‐Pucko
;
Eirini Parmenopoulou
;
Djero B. L. Peeters
;
Antonio Miriametro
;
Takashi Taniguchi
(National Institute for Materials Science
)
;
Kenji Watanabe
(National Institute for Materials Science)
;
Adam Babinski
;
Maciej R. Molas
;
Marco Felici
;
Antonio Polimeni
Collection
Citation
Description:
(abstract)Monolayers (MLs) of semiconducting transition-metal dichalcogenides (TMDCs) are promising materials as host of efficient single-photon emitters (SPEs). The emitters appear at cryogenic temperatures and are most often associated to the presence of mechanical deformations (strain). Thus, spatially controlled strain fields would enhance the scalability of such SPEs and their integrability into photonic structures. Regular arrays of strained hydrogen-filled micro- and nano-bubbles (domes) can be created by hydrogen-ion irradiation of bulk TMDC flakes in combination with lithographic techniques. However, SPE observation is hindered by the H2 liquefaction for temperatures T< 33 K. In this work, the domes’ deflation below such temperature is overcome by depositing few-layer hexagonal boron nitride (hBN) on top of the domes. hBN heterostructuring leads indeed to the preservation of the dome geometry at all temperatures, as derived by micro-Raman (µ-Raman) and micro-photoluminescence (µ-PL) spectroscopy on MoS2 and WS2 domes. Eventually, ordered arrays of capped WS2 domes show the appearance, at 5 K, of intense narrow emission lines. By measuring their second-order autocorrelation function, these lines are confirmed as originating from quantum emitters. The electronic properties of the emitters were addressed by time-resolved µ-PL yielding time decays of (1–10 ns) and by magneto-µ-PL providing an average exciton gyromagnetic factor of -8.2 largely exceeding the values observed in planar strain-free MLs.
Rights:
Keyword: Single-photon emitters, hydrogen-filled micro-domes, hBN heterostructuring
Date published: 2023-04-08
Publisher: Wiley
Journal:
- Advanced Optical Materials (ISSN: 21951071) vol. 11 issue. 12 2202953
Funding:
- Narodowym Centrum Nauki 2017/27/B/ST3/00205
- Narodowym Centrum Nauki 2018/31/B/ST3/02111
Manuscript type: Publisher's version (Version of record)
MDR DOI:
First published URL: https://doi.org/10.1002/adom.202202953
Related item:
Other identifier(s):
Contact agent:
Updated at: 2025-02-14 12:31:49 +0900
Published on MDR: 2025-02-14 12:31:49 +0900
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