Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 80: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales II

O 80.8: Vortrag

Donnerstag, 21. März 2024, 12:15–12:30, MA 041

Selectively Addressing Plasmonic Modes and Excitonic States in a Nanocavity Hosting a Quantum Emitter — •Alberto Martin-Jimenez¹, Oscar Jover², Koen Lauwaet¹, Daniel Granados¹, Rodolfo Miranda^1,2, and Roberto Otero^1,2 — ¹IMDEA Nanoscience, Madrid, Spain — ²Dep. De Física de la Materia Condensada & IFIMAC, Universidad Autónoma de Madrid, Madrid, Spain

Controlling the interaction between the excitonic states of a quantum emitter and the plasmonic modes of a nanocavity is key for the development of quantum information processing devices. In this contribution we demonstrate that the tunnel electroluminescence of electrically insulated C60 nanocrystals enclosed in the plasmonic nanocavity at the junction of a scanning tunneling microscope can be switched from a broad emission spectrum, revealing the plasmonic modes of the cavity, to a narrow band emission, displaying only the excitonic states of the C60 molecules by changing the bias voltage applied to the junction. Interestingly, excitonic emission dominates the spectra in the high-voltage region in which the simultaneously acquired inelastic rate is low, demonstrating that the excitons cannot be created by an inelastic tunnel process. These results point toward new possible mechanisms for tunnel electroluminescence of quantum emitters and offer new avenues to develop electrically tunable nanoscale light sources.

Keywords: Quantum emitter; Plasmonic emission; Excitonic emission; STM-induced electroluminescence; C60 Nanocrystals