Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Quantum Optics and Nuclear Quantum Optics II
Q 40.2: Vortrag
Mittwoch, 12. März 2025, 14:45–15:00, AP-HS
Interference effects in an electron-driven quantum emitter — •Hebrew Crispin1 and Nahid Talebi2 — 1Christian-Albrechts-Universität, Kiel, Germany — 2Christian-Albrechts-Universität, Kiel, Germany
Cathodoluminescence spectroscopy has emerged as a platform for studying the quantum aspects of light on the nanoscale. Since the experimental demonstration of photon anti-bunching and super-bunching effects by electron excitations, considerable efforts have been devoted towards understanding the electron-matter interactions and the light emission in cathodoluminescence. A theoretical description of the observed photon statistics has been provided by several authors. However, the majority of these approaches rely on classical models. In addition, the electron-beam-excitations of only two-level systems has been the focus so far. Here, we propose a theoretical framework for cathodoluminescence from a multi-level quantum emitter. Modeling the electron-beam-excitation as an incoherent broadband field driving the emitter, we obtain a quantum optical master equation for the system. We show that the presence of different transition pathways can give rise to quantum interference effects. The induced interference significantly modifies the emitter dynamics and the time-dependent spectra. We find that the interference is sensitive to the excitation rate, the initial coherence, and the excited level splitting. Our model reveals the possibility of electron-beam-induced quantum interferences in cathodoluminescence emission and provides a framework to explore quantum optical effects in electron-driven multi-level systems.
Keywords: cathodoluminescence; quantum interference; spectroscopy; quantum optics; electron matter interaction