Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity
Entity
UAM. Departamento de Física de la Materia Condensada; UAM. Departamento de Física Teórica de la Materia CondensadaPublisher
The American Physical SocietyDate
2013-04-04Citation
10.1103/PhysRevB.87.155403
Physycal Review B 87.15 (2013): 155403
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.87.155403Funded by
This work was supported by Grants-in-Aid for Scientific Research (22221006, 24360016, 24651116, and 22760028) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, Funding Program for Next Generation World-Leading Researchers. This work is also supported by MAT2011-23627, CSD2010-00024, PLE2009- 0061 (MINECO, Spain). P.P. was supported by the Ramón y Cajal program (MINECO, Spain).We further acknowledge the support provided by the Czech Science Foundation (GACR) under the projects P204/11/P578 and P204/10/0952, the GAAV project IAA100100905 and project M100101207Editor's Version
http://dx.doi.org/10.1103/PhysRevB.87.155403Subjects
FísicaRights
© 2013 American Physical SocietyAbstract
We report force mapping experiments on Si(111)-(7×7) surfaces with adsorbed hydrogen, using atomic force microscopy at room temperature supported by density functional theory (DFT) simulations. On the basis of noncontact atomic force microscopy (NC-AFM) images as well as force versus distance curves measured over both hydrogen-passivated and bare Si adatoms, we identified two types of tip termination, which result in different modes of interaction with the surface. The statistics of the tip dependence of the measured forces, which are effectuated using various tip states with different cantilevers, reveal the typical values of the force and their distribution in the two characteristic interaction modes. The experimental results are corroborated by DFT calculations performed for different tip structures. As a reactive tip, the dimer-terminated Si tip yields results in satisfactory agreement with experimental force curves for hydrogen-passivated and nonpassivated Si adatom sites. An oxidized Si dimer tip that bears a hydroxyl group on its apex reproduces well the experimental force curves acquired by nonreactive tips. This tip model could thus be used to interpret the experimentally obtained weak image contrast for the Si(111)-(7×7) surface. The forces are thought to arise as a result of a weak electrostatic interaction involving a permanent dipole at the tip apex enhanced by the charge density redistribution due to the interaction with surface adatoms
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Google Scholar:Yurtsever, Ayhan
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Sugimoto, Yoshiaki
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Tanaka, Hideki
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Abe, Masayuki
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Morita, Seizo
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Ondráček, Martin
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Pou Bell, Pablo
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Pérez Pérez, Rubén
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Jelínek, Pavel
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