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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/15364

Title: Energy dissipation unveils atomic displacement in the noncontact atomic force microscopy imaging of Si(111)-(7×7)
Authors: Arai, Toyoko
Inamura, Ryo
Kura, Daiki
Tomitori, Masahiko
Keywords: atomic force microscopy
energy dissipation
silicon
surface
Issue Date: 2018-03-19
Publisher: American Physical Society
Magazine name: Physical Review B
Volume: 97
Start page: 115428-1
End page: 115428-6
DOI: 10.1103/PhysRevB.97.115428
Abstract: The kinetic energy of the oscillating cantilever of noncontact atomic force microscopy (nc-AFM) at room temperature was considerably dissipated over regions between a Si adatom and its neighboring rest atom for Si(111)-(7 × 7) in close proximity to a Si tip on the cantilever. However, nc-AFM topographic images showed no atomic features over those regions, which were the hollow sites of the (7 × 7). This energy dissipation likely originated from displacement of Si adatoms with respect to the tip over the hollow sites, leading to a lateral shift of the adatoms toward the rest atom. This interaction led to hysteresis over each cantilever oscillation cycle; when the tip was retracted, the Si adatom likely returned to its original position. To confirm the atomic processes involved in the force interactions through Si dangling bonds, the Si(111)-(7 × 7) surface was partly terminated with atomic hydrogen (H) and examined by nc-AFM. When the Si adatoms and/or the rest atoms were terminated with H, the hollow sites were not bright (less dissipation) in images of the energy dissipation channels by nc-AFM. The hollow sites acted as metastable sites for Si adatoms in surface diffusion and atom manipulation; thus, the dissipation energy which is saturated on the tip likely corresponds to the difference in the potential energy between the hollow site and the Si adatom site. In this study, we demonstrated the ability of dissipation channels of nc-AFM to enable visualization of the dynamics of atoms and molecules on surfaces, which cannot be revealed by nc-AFM topographic images alone.
Rights: Toyoko Arai, Ryo Inamura, Daiki Kura, and Masahiko Tomitori, Physical Review B, 97, 2018, 115428-1-115428-6. Copyright 2018 by the American Physical Society. http://dx.doi.org/10.1103/PhysRevB.97.115428
URI: http://hdl.handle.net/10119/15364
Material Type: publisher
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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