@article{Murata2018, 
author = {Yuya Murata and Tommaso Cavallucci and Valentina Tozzini and Niko Pavliček and Leo Gross and Gerhard Meyer and Makoto Takamura and Hiroki Hibino and Fabio Beltram and Stefan Heun},
title = {Atomic and electronic structure of Si dangling bonds in quasi-free-standing monolayer graphene},
year = {2018},
journal = {Nano Research},
volume = {11},
number = {2},
pages = {864-873},
keywords = {quasi-free-standing monolayer graphene, hydrogen intercalation, carrier mobility, scanning tunneling microscopy, scanning tunneling spectroscopy, atomic force microscopy, density functional theory},
url = {https://www.sciopen.com/article/10.1007/s12274-017-1697-x},
doi = {10.1007/s12274-017-1697-x},
abstract = {Si dangling bonds at the interface of quasi-free-standing monolayer graphene (QFMLG) are known to act as scattering centers that can severely affect carrier mobility. Herein, we investigate the atomic and electronic structure of Si dangling bonds in QFMLG using low-temperature scanning tunneling microscopy/spectroscopy (STM/STS), atomic force microscopy (AFM), and density functional theory (DFT) calculations. Two types of defects with different contrast were observed on a flat graphene terrace by STM and AFM; in particular, their STM contrast varied with the bias voltage. Moreover, these defects showed characteristic STS peaks at different energies, 1.1 and 1.4 eV. The comparison of the experimental data with the DFT calculations indicates that the defects with STS peak energies of 1.1 and 1.4 eV consist of clusters of three and four Si dangling bonds, respectively. The relevance of the present results for the optimization of graphene synthesis is discussed.}
}