Quantum Confinement Emissions in Strained Monolayer WSe 2 : A Nanoscale Approach to Single-Photon Emitters via Tip-Enhanced Techniques

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Abstract
Two-dimensional (2D) semiconductors such as monolayer WSe2 have attracted significant interest for their quantum properties and potential as scalable single-photon emitters. However, conventional microphotoluminescence (μ-PL) techniques are fundamentally limited by optical diffraction, hindering access to critical nanoscale features such as strain gradients and localized quantum confinement. In this study, we utilize tip-enhanced photoluminescence (NanoPL) with a spatial resolution of ≈10 nm to directly image the emission landscape of monolayer WSe2 on top of nanopillars at room temperature. Our results reveal two distinct localization regimes associated with leading theoretical models for single-photon activation and provide guidelines for deterministic nanoengineering of quantum light sources.
Funding Information
  • Fundação de Amparo à Pesquisa do Estado de Minas Gerais (APQ - 04852-23)
  • Fundação de Amparo à Pesquisa do Estado de Minas Gerais (RED-00081-23)
  • Ministry of Education, Culture, Sports, Science and Technology
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (421469/2023-4)
  • Japan Society for the Promotion of Science (21H05233)
  • Japan Society for the Promotion of Science (23H02052)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (2022/10340-2)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (2024/21070-1)
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

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