Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: 2D Materials VIII – Quantum emitters and defects
HL 47.2: Vortrag
Donnerstag, 12. März 2026, 15:15–15:30, POT/0081
Room Temperature Visualization of Exciton Confinement in Single Photon Emitters samples — •Lucas Liberal1, Rafael Nadas2, Frederico B. Sousa1, Maria Clara Godinho3, Gabriel Jacobsen1, Takashi Taniguchi4, Kenji Watanabe4, Marcio Teodoro1, Ado Jorio3, and Leonardo Campos3 — 1Departamento de Física, Universidade Federal de São Carlos, São Carlos, Brasil — 2Institut fur Physik, Humboldt-Universitat zu Berlin, Newtonstraße 15, Berlin, Germany — 3Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil — 4Research Center for Materials Nanoarchitectonics, NIMS, Tsukuba, Japan
Two-dimensional semiconductors such as monolayer WSe2 have attracted significant interest due to their remarkable quantum properties and their potential as scalable single-photon emitters. However, conventional micro-photoluminescence (µ-PL) techniques are fundamentally limited by optical diffraction, preventing direct access to critical nanoscale features such as strain gradients and highly localized quantum confinement. In this study, we employ tip-enhanced photoluminescence with a spatial resolution of 10 nm to image, at room temperature, the emission landscape of monolayer WSe2 suspended over nanopillars. Our measurements reveal two distinct localization regimes consistent with leading theoretical models for single-photon activation: one arising from intervalley defect exciton hybridization and another driven purely by strain-induced confinement. These results provide practical guidelines for the deterministic nanoengineering of quantum light sources.
Keywords: TMDs; TEPL; Quantum emitters; 2D materials; Photoluminescence