Electronic properties of (2 x 1) and c(4 x 2) domains on Ge(001) studied by scanning tunneling spectroscopy


Gurlu O. , ZANDVLIET H., POELSEMA B.

PHYSICAL REVIEW LETTERS, vol.93, no.6, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 93 Issue: 6
  • Publication Date: 2004
  • Doi Number: 10.1103/physrevlett.93.066101
  • Title of Journal : PHYSICAL REVIEW LETTERS

Abstract

The surface electronic structure of Ge(001) was studied by scanning tunneling spectroscopy. The measured surface densities of states unequivocally reveal the presence of a metallic state on the (2x1) domains, which is absent on the c(4x2) domains. This metallic state, so far observed only in integral measurements, is attributed to the flip-flopping dimers that constitute the (2x1) domains. Our data also reveal a set of previously unresolved surface states, in perfect agreement with published theoretical predictions.