Scanning tunneling spectroscopy of quantum well and surface states of thin Ag films grown on GaAs(110)

C. S. Jiang, H. B. Yu, Ph Ebert, X. D. Wang, C. K. Shih

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We investigate the electronic states of thin Ag films grown on GaAs(110) surfaces at low temperatures by scanning tunneling spectroscopy with single-layer thickness resolution. We identify the quantum-well states arising from the z confinement of the two-dimensional Ag films, and find an unoccupied Shockley-type surface state (formula presented) above the Fermi energy. The s-p electronic band dispersion along the Γ-L direction is found to be shifted upward by (formula presented) compared to pure Ag(111) surfaces. This shift, and the fact that the Shockley-type surface state is unoccupied and thus also shifted upward compared to pure Ag(111) surfaces are connected to the lattice strain of the quasiperiodically modulated Ag film. Implications of the results for other Ag thin films are discussed.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number23
DOIs
StatePublished - 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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