Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales III
O 91.8: Vortrag
Donnerstag, 21. März 2024, 17:00–17:15, MA 041
Statistical properties of light emission in current-driven single-molecule STM-junctions — •Andrés Bejarano1, 2, Rémi Avriller2, Thomas Frederiksen1, 3, and Fabio Pistolesi2 — 1Donostia International Physics Center (DIPC), E-20018 Donostia-San sebastián, Spain — 2Univ. Bordeaux, CNRS, LOMA, F-33405 Talence, France — 3Ikerbasque, Basque Foundation for Science, E-48013 Bilbao, Spain
The atomic resolution of the scanning tunneling microscope (STM) enables fluorescence on the scale of single molecules. Recent experiments demonstrate the change from a broad plasmonic resonance to a sharp peak in the photon emission spectrum, by moving the tip laterally from the bare substrate towards the molecule [1]. These systems are of particular interest to the quantum cryptography community because they have been reported to emit non-classical light (antibunching) [2, 3]. We propose a microscopic model based on quantum master equation approach for the reduced density matrix of the central system. In particular, we focus on the description of the emission spectrum, conductivity and photon coherence. Additionally, by using full counting statistics, we calculate the Fano factor and correlations between emission and currents. The model provides a simple framework to explain the features observed experimentally in the photon spectrum and the electronic conductance. [1] B. Doppagne et al., Science 361, 251 (2018) [2] P. Merino et al., Nat. Commun. 6, 8461 (2015) [3] L. Zhang et al., Nat. Commun. 8, 580 (2017)
Keywords: Light-emission; Scanning Tunneling Microscope Fluorescence; Electron-Photon Statistics