Direct evidence of the contribution of surface states to the Kondo resonance

Q. Li, S. Yamazaki, T. Eguchi, H. Kim, S. J. Kahng, J. F. Jia, Q. K. Xue, Y. Hasegawa

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Abstract

Using low-temperature scanning tunneling microscopy/spectroscopy, the Kondo resonance was observed on an isolated 5, 10, 15, 20-tetrakis-(4-bromophenyl)- porphyrin-Co (TBrPP-Co) molecule adsorbed on the Si (111) -3×3Ag substrate. As the substrate has a two-dimensional surface state and does not have bulk states around the Fermi level (EF), the Fano-shaped peak near EF observed above the molecule caging a spin-active cobalt atom is a direct evidence of the contribution of the surface-state electrons to the Kondo resonance. The long decay length (∼1.6nm) of the resonance also supports for the surface-state contribution.

Original languageEnglish
Article number115431
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number11
DOIs
Publication statusPublished - 2009 Sep 25

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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