Journal
APPLIED SURFACE SCIENCE
Volume 256, Issue 2, Pages 469-474Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.07.023
Keywords
Scanning tunneling microscopy; Scanning tunneling spectroscopy; Screening; The Friedel oscillation; Electron standing waves; Two-dimensional electron system
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Using low-temperature scanning tunneling microscopy/spectroscopy we have developed a method for measuring electrostatic potential in high spatial and energy resolutions, and performed a real-space observation of the potential screened by two-dimensional surface electrons around step edges, where extra charges are localized, on the Si(1 1 1)root 3 x root 3-Ag surface. In the potential images, characteristic decay and the Friedel oscillation were clearly observed around the charges. (C) 2009 Elsevier B.V. All rights reserved.
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