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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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Single-photon emitters, hydrogen-filled micro-domes, hBN heterostructuring

刊行年月日: 2023-04-08

出版者: Wiley

掲載誌:

• Advanced Optical Materials (ISSN: 21951071) vol. 11 issue. 12 2202953

研究助成金:

• Narodowym Centrum Nauki 2017/27/B/ST3/00205
• Narodowym Centrum Nauki 2018/31/B/ST3/02111

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adom.202202953

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更新時刻: 2025-02-14 12:31:49 +0900

MDRでの公開時刻: 2025-02-14 12:31:49 +0900