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.
@article{arxiv.1803.00742,
title = {Selective resolution of phonon modes in STM-IETS on clean and oxygen-adsorbed Cu(100) surfaces},
author = {Minjun Lee and Myungchul Oh and Hoyeon Jeon and Sunwouk Yi and Inhae Zoh and Chao Zhang and Jungseok Chae and Young Kuk},
journal= {arXiv preprint arXiv:1803.00742},
year = {2019}
}
Comments
19 pages, 4 figures, supplementary material with 2 figures