Selective resolution of phonon modes in STM-IETS on clean and oxygen-adsorbed Cu(100) surfaces
arXiv:1803.00742 · doi:10.1016/j.susc.2019.06.001
Abstract
The observation of surface phonon dispersion using local probes can provide important information related to local structural and thermal properties. In this study, surface phonon modes on a Cu(100) surface were measured using the inelastic tunneling spectroscopy of scanning tunneling microscopy (STM-IETS) with atomically sharp tips. Different phonon modes were selectively measured depending on the structures of the probing tips or the surfaces. Two different surface phonon modes, at 19.0 meV on a clean Cu(100) surface and at 13.5 meV on an oxygen-adsorbed Cu(100) surface, are explained by the selection rules. Additionally, the spatial variation in STM-IETS showed surface stress relaxation.
arXiv comment19 pages, 4 figures, supplementary material with 2 figures
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