ACS nano · 2026
Quantum Confinement Emissions in Strained Monolayer WSe2: A Nanoscale Approach to Single-Photon Emitters via Tip-Enhanced Techniques.
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Liberal Lucas, Nadas Rafael Battistella, Soares Gustavo H R, Sousa Frederico B, Godinho Maria Clara, Marques Jacobsen Gabriel, Taniguchi Takashi, Watanabe Kenji, Teodoro Marcio Daldin, Jorio Ado, Campos Leonardo Cristiano
Аннотация
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.