SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 3: Focus Session: Progress in Hybrid Phononic Quantum Technologies I
HL 3.8: Vortrag
Montag, 27. März 2023, 12:30–12:45, POT 151
Imaging surface acoustic waves on 2D materials using atomic force microscopy — •Mingyun Yuan1, Alberto Hernández-Mínguez1, Igor Aharonovich2, and Paulo V. Santos1 — 1Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Berlin, Germany — 2School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, Australia
There is an increasing interest in coupling the dynamic strain of surface acoustic waves (SAWs) to electronic excitations in 2D-material-based nanostructures to acoustically manipulate their optoelectronic properties. While optical phenomena in 2D nanostructures can be conveniently mapped by photoluminescence, local probing of mechanical properties remains challenging. This task can, nevertheless, be assisted by high-frequency (GHz) SAWs, which are particularly suitable for probing very thin objects due to their micron-size wavelengths and their confinement near the surface. Here, we use atomic force microscopy (AFM) to image SAWs propagating along a LiNbO3 acoustic resonator containing a multilayer hexagonal Boron Nitride (hBN) flake irradiated with Ar ions to create color centers. The high spatial resolution of AFM enables us to investigate the SAW strain transferred to the flake. We observe spatial inhomogeneities, revealing that the strain transferred to 2D materials can exhibit large spatial fluctuations. Possible mechanisms that affect the coupling will be discussed. Our method demonstrates a straight-forward way to characterize dynamic strain fields in hybrid SAW/2D-material systems.