SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster: 2D Materials II
O 36.8: Poster
Tuesday, March 28, 2023, 18:00–20:00, P2/EG
Local spectroscopy of acoustic phonons in low-dimensional materials — •Yi Zhang1, Shaoxiang Sheng1,2, Susanne Baumann1, and Sebastian Loth1,2 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany
Coherent acoustic phonons (CAPs) enable ultrafast control of solids and have been exploited for applications in various acoustic devices. THz-induced ultrafast Coulomb forces in a scanning tunnelling microscope (STM) junction can locally generate CAP wave packets that propagate with low losses and form longitudinal acoustic standing waves in a thin Au film on mica [1,2]. Here we develop a discrete lattice model to simulate acoustic phonon propagation in well-defined nanostructures. We predict that transverse acoustic phonons can be detected in 1D chains or in 2D thin films by THz-STM. This enables investigation of mechanical properties and electron-phonon interaction in nano-materials at the atomic scale. [1] S. Sheng, et al. Physical Review Letters 129, 043001 (2022). [2] M. Abdo, et al. ACS Photonics 8, 702-708 (2021).