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Time-Dependent Tunneling Spectroscopy for Studying Surface Diffusion Confined in Nanostructures

Authors Wang, Kedong
Zhang, Chun HKUST affiliated (currently or previously)
Loy, Michael M.T. View this author's profile
Xiao, Xudong HKUST affiliated (currently or previously)
Issue Date 2005
Source Physical Review Letters , v. 94, (3), January 2005,Article no. 036103
Summary By confining a diffusion atom in a nanometer region using surface potential heterogeneity, we have successfully employed a time-dependent tunneling spectroscopy to quantitatively study its random motion. A hopping rate in the range of 1–104  Hz, ∼ 3 orders of magnitude faster than those accessible by the existing diffusion methods based on scanning tunneling microscopy, was demonstrated for single Cu atoms diffusing in the faulted half unit cell of Si(111)−(7×7). Our technique is potentially useful to detect fast diffusion processes such as H quantum diffusion at atomic scale.
ISSN 0031-9007
Rights © 2005 The American Physical Society
Language English
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