Scanning tunneling spectroscopy of Na on Cu(111)

Jörg Kliewer, Richard Berndt

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46 Scopus citations


Monolayer films of Na evaporated onto Cu(111) under UHV conditions are investigated with scanning tunneling microscopy and spectroscopy (STS) at low temperature. The STS data clearly reveal a two-dimensional overlayer state of Na on Cu(111). From STS and spectroscopic imaging, the binding energies and effective masses of this state are determined for various coverages. The state is demonstrated to be affected by spatial inhomogeneities such as Cu steps or local coverage variations. Drastic bias-dependent variations of apparent step heights and tunneling barrier heights are reported and interpreted in terms of the large contributions of the overlayer state to the tunneling current.

Original languageEnglish (US)
Article number035412
Pages (from-to)354121-354126
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
StatePublished - Jan 15 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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