Vibration of Dimer on Ge(001) Surface Excited Coherently by Tunneling Current of Scanning Tunneling Microscopy

Autor:	Osamu Narikiyo, Hiroshi Kawai
Rok vydání:	2004
Předmět:	Microscope Materials science Scanning tunneling spectroscopy General Physics and Astronomy Biasing Spin polarized scanning tunneling microscopy law.invention law Condensed Matter::Superconductivity Excited state Scanning tunneling microscope Atomic physics Quantum tunnelling Excitation
Zdroj:	Journal of the Physical Society of Japan. 73:2362-2365
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.73.2362
Popis:	The vibration of a dimer on a Ge(001) surface with a high vibrational number excited coherently by tunneling current of scanning tunneling microscopes (STMs), is theoretically investigated. The transformation of the local structures reported in STM experiments is shown to be driven by the dimer vibration excited coherently by the tunneling current of STM. The sample bias voltage of STM above which the transformation to the p(2 ×2) structure is able to be observed in the experiments, is semiquantitatively reproduced by the quasi-one-dimensional character of the π * -band. We show that the excitation rate has a term that does not decay with the distance from the STM tip for the one-dimensional band. The contrasting difference in shape of the transformed region that depends on the sign of the bias voltage observed in the experiments is explained by the dimensionalities of the π * -band and the π-band on the Ge(001) surface.
Databáze:	OpenAIRE
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