TY - JOUR
T1 - Model potential of dimer system and coherence length of electron injected by scanning tunneling microscope on Ge(0 0 1) surface
AU - Kawai, Hiroshi
AU - Yoshimoto, Yoshihide
AU - Narikiyo, Osamu
AU - Hanawa, Yosuke
AU - Imamura, Akimasa
N1 - Funding Information:
The first-principles calculations in this work were performed using an extended version of TAPP (Tokyo Ab-initio Program Package) [46,47] , using the facilities of the Supercomputer Center, Institute for Solid State Physics, University of Tokyo. This work was supported in part by a Grant-in-Aid for Scientific Research (C) from the Japan Society for the Promotion of Science.
PY - 2008/9/15
Y1 - 2008/9/15
N2 - An improved model potential of the dimer system on the Ge(0 0 1) surface is obtained on the basis of the results of first-principles calculations. The electron-vibration coupling constant on the Ge(0 0 1) surface is obtained using the improved model potential. We propose a new theoretical formula for the coherence length of the tunneling electron injected by scanning tunneling microscope onto the semiconductor surface band. In the formula, the decoherence of the propagating electron is attributed to the strong electron-vibration coupling. The formula semi-quantitatively reproduces the decay length of the standing wave observed on the Ge(0 0 1) surface, and explains why the decay length of the standing wave on the Ge(0 0 1) surface is short even though the surface-localized bands on the Ge(0 0 1) surface are semiconductive.
AB - An improved model potential of the dimer system on the Ge(0 0 1) surface is obtained on the basis of the results of first-principles calculations. The electron-vibration coupling constant on the Ge(0 0 1) surface is obtained using the improved model potential. We propose a new theoretical formula for the coherence length of the tunneling electron injected by scanning tunneling microscope onto the semiconductor surface band. In the formula, the decoherence of the propagating electron is attributed to the strong electron-vibration coupling. The formula semi-quantitatively reproduces the decay length of the standing wave observed on the Ge(0 0 1) surface, and explains why the decay length of the standing wave on the Ge(0 0 1) surface is short even though the surface-localized bands on the Ge(0 0 1) surface are semiconductive.
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U2 - 10.1016/j.susc.2008.07.028
DO - 10.1016/j.susc.2008.07.028
M3 - Article
AN - SCOPUS:52049113189
SN - 0039-6028
VL - 602
SP - 3010
EP - 3017
JO - Surface Science
JF - Surface Science
IS - 18
ER -