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HL: Fachverband Halbleiterphysik
HL 1: Nitrides: Preparation and characterization I
HL 1.7: Hauptvortrag
Montag, 18. März 2024, 11:15–11:45, EW 015
Strong light-matter interaction probed by cathodoluminescence spectroscopy — •Fatemeh Chahshouri1 and Nahid Talebi1,2 — 1Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Kiel, Nano, Surface, and Interface Science -KiNSIS, Kiel University, 24098 Kiel, Germany
Electron microscopy is a powerful tool that offers detailed views of a composition of biological, chemical, and semiconductor structures with atomic-scale resolution. Additionally, it enables us to study quantum phenomena at the nanoscale and explore exciting phenomena, such as probing (quantum-)optical excitation and tailoring the shape of electron beams, where the latter further allows for more advanced characterization techniques. In this talk, we will discuss the functionality of cathodoluminescence spectroscopy in investigating the formation and propagation of exciton-polaritons in van der Waals materials. We will further discuss how generated secondary electron carriers in the heterostructure of group III nitride materials can interact with defects and Schottky barriers and generated two-dimensional electron gas inside the heterojunction. Furthermore, we will describe our numerical investigations on modulating and shaping the electron wavepacket after interacting with laser-induced optical near-fields in the vicinity of the material. Our work introduces new possibilities, allowing electrons to be utilized as a nanoscale source for probing matter and opens up avenues for improving state-of-the-art electron microscopy through the use of tunable electron beams in enhancing the electron beam interaction with light and matter.
Keywords: Cathodoluminescence; Exciton-photon coupling; AlGaN/GaN heterojunction; Defect based luminscense; Photon-induced near-field electron microscopy