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Tunneling Current Change of Graphite Surface by Single Ion Irradiation

Published online by Cambridge University Press:  03 September 2012

H. Ogiso ,
W. Mizutani ,
S. Nakano ,
H. Tokumoto  and
K. Yamanaka
H. Ogiso
Affiliation:
Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research, 1-1–4 Higashi, Tsukuba, Ibaraki, 305, Japan Mechanical Engineering Laboratory, 1–2 Namiki, Tsukuba, Ibaraki, 305, Japan
W. Mizutani
Affiliation:
Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research, 1-1–4 Higashi, Tsukuba, Ibaraki, 305, Japan
S. Nakano
Affiliation:
Mechanical Engineering Laboratory, 1–2 Namiki, Tsukuba, Ibaraki, 305, Japan
H. Tokumoto
Affiliation:
Joint Research Center for Atom Technology, National Institute for Advanced Interdisciplinary Research, 1-1–4 Higashi, Tsukuba, Ibaraki, 305, Japan
K. Yamanaka
Affiliation:
Mechanical Engineering Laboratory, 1–2 Namiki, Tsukuba, Ibaraki, 305, Japan
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Abstract

We discuss changes in electronic structure and the topography of a graphite surface undergoing by a single ion impact. Protrusion-like regions (PLRs) found in a scanning tunneling microscope image disappeared in the same view of a noncontact atomic force microscope image. We measured tunneling current versus voltage characteristics to determine the density-of-states change in PLRs. We found that the density of states at the Fermi level of PLRs was greater than that of the intact surface. We therefore concluded that the PLRs were not actual topographical changes, but originated from electronic structural changes in semimetal to metal transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 438: Symposium A – Materials Modificaton and Synthesis by Ion Beam… , 1996 , 561
Copyright
Copyright © Materials Research Society 1997

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