Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 18: Nanomechanical systems (joint session HL/TT)
HL 18.9: Vortrag
Dienstag, 10. März 2026, 12:15–12:30, POT/0051
Imaging GHz surface acoustic waves in epitaxial graphene cavities — •Mingyun Yuan1, Alberto Hernández-Mínguez1, Yi-Ting Liou2, Jens Herfort1, Joao M. J. Lopes1, and Paulo V. Santos1 — 1Paul-Drude-Institut, Leibniz Institut im Forschungsverbund e.V., Berlin, Germany — 2Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany
The imaging of sound has fascinated scientists and the public alike, dating back to Chladni's demonstrations in the 19th century. Nowadays, it is possible to image mechanical vibrations at the nanoscale, enabling direct probing of propagation, scattering and diffraction for high-frequency acoustic waves with short wavelengths. Here, we present the imaging of GHz surface acoustic waves (SAWs) in an epitaxial monolayer graphene nanostructure, based on thermal decomposition of SiC, using atomic-force microscopy (AFM). We observe a near-perfect strain transfer that gives rise to rich acoustic patterns in the phononic cavity formed by the graphene nanostructure. Furthermore, the enhanced acoustic intensity in the graphene region indicates a waveguiding effect, with graphene serving as an atomically thin, embedded shorting layer. Within the cavity, signatures of quantum chaos are observed. The high spatial resolution of AFM enables the investigation of SAW strain transferred onto 2D materials with high precision. The results also demonstrate an epitaxial nanophononic platform for both functional acoustic devices and fundamental studies of quantum phenomena.
Keywords: surface acoustic wave; epitaxial graphene; AFM; phononic cavity; quantum chaos