SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 2: 2D Materials and their Heterostructures II: h-BN and WSe2
DS 2.2: Vortrag
Montag, 27. März 2023, 11:45–12:00, SCH A 316
Phase-locked photon-electron interaction without a laser applied to 2D Materials — •Nahid Talebi1, Masoud Taleb1, Mario Hentschel2, Kai Rossnagel1, and Harald Giessen2 — 1Institute for Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany — 24th Physics Institute and Research Center SCoPE, University of Stuttgart, 70569 Stuttgart, Germany
Ultrafast electron-photon spectroscopy in electron microscopes commonly requires ultrafast laser setups. Photoemission from an engineered electron source is used to generate pulsed electrons, interacting with a sample that is excited by the ultrafast laser pulse at a specified time delay. Here, we present an inverse approach based on cathodoluminescence spectroscopy to introduce internal radiation sources in an electron microscope. Our method is based on a sequential interaction of the electron beam with an electron-driven photon source (EDPHS) and the investigated sample. An electron-driven photon source in an electron microscope generates phase-locked photons that are mutually coherent with the near-field distribution of the swift electron. We demonstrate the mutual coherence between the radiations from the EDPHS and the sample by performing interferometry with a combined system of an EDPHS and a WSe2 flake. Our method has the advantage of being simple, compact and operating with continuous electron beams. It will open the door to local electron-photon correlation spectroscopy of quantum materials, single photon systems, and coherent exciton-polaritonic samples with nanometric resolution.