Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 26: 2D Materials and Heterostructures: Quantum Emitters and Defects

HL 26.9: Vortrag

Mittwoch, 20. März 2024, 11:45–12:00, EW 201

Substrate-dependent quantum and magneto-optical properties of WSe₂ single-photon emitters — •Bárbara Rosa¹, Caique Serati de Brito², Cesar Ricardo Rabahi², Ingrid D. Barcelos³, Yara Galvão Gobato², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany — ²Department of Physics, Federal University of São Carlos, São Carlos, Brazil — ³Brazilian Synchrotron Light Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, Brazil

Two-dimensional (2D) van der Waals materials have arisen as a novel platform to explore the characteristics of non-classical light throughout the fabrication of single-photon emitters (SPEs). Their large range of emission wavelengths, site-controllability, and the accessible properties tuning by engineered strain and defects, turning them into potential candidates for several applications. Here, we investigate the quantum-optical properties of WSe₂ SPEs generated on different substrates. Interestingly, by conducting off- and quasi-resonant optical excitation, we observe a substrate dependence on the number of quantum emitters and their extracted linewidths, in which the doped surfaces command the properties of defect-states created in WSe₂ SPEs. Similar effects are also observed in the multi-photon suppression determined through photon correlation measurements. In addition, we performed magneto-photoluminescence studies, where extracted g-factors for the systems above show a remarkably substrate-dependent response.

Keywords: WSe2; SPE; quantum properties; magnei-PL; optical spectroscopy