Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 15: Nanoscale Probing of Functional Properties
FM 15.1: Vortrag
Mittwoch, 11. März 2026, 15:00–15:15, BEY/0E40
Nanoscale Phonon Dynamics Studied In-Situ by Laser Stimulated Vibrational Electron Energy-Gain Spectroscopy — •Mairi McCauley1,2, Joel Martis3, Ondrej Krivanek3, Ben Plotkin-Swing3, Tolga Wagner1,2, Hüseyin Çelik1,4, Grigory Kornilov1, Katrina Coogan1,2, Meng Zhao1,2, Andreas Mittelberger3, Matthias Meffert5, Luca Piazza5, Tracy Lovejoy3, Guillaume Radtke6, Christoph Koch1,2, and Benedikt Haas1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 2Center for the Science of Materials Berlin, Humboldt-Universität zu Berlin, Berlin, Germany — 3Bruker AXS LLC, Kirkland, WA, USA — 4Institute for Physics and Astronomy, Technische Universität Berlin, Berlin, Germany — 5DECTRIS AG, Baden-Daettwil, Switzerland — 6Sorbonne Université, CNRS UMR 7590, MNHN, IMPMC, Paris, France
Advances in instrumentation allow to directly probe phonon dispersions at the nanoscale using electron energy gain and loss spectroscopy (EEGS/EELS) within a scanning transmission electron microscope (STEM). By integrating a laser injection system, we enable the investigation of stimulated phonons at the spatial resolution determined by the electron beam. A synchronised laser-detector configuration enables nanosecond-scale time-resolved measurements. The thermal conductivity of amorphous carbon and silicon nitride was investigated by local time-resolved temperature measurements and is compared to numerical simulations. Ongoing work applies the system to study phonon transport through defects and interfaces at atomic resolution.
Keywords: Scanning transmission electron microscopy; Phonons; Electron energy loss spectroscopy; Electron energy gain spectroscopy