This title appears in the Scientific Report : 2003 

Importance of carrier dynamics and conservation of momentum in atom-selective scanning tunneling microcopy imaging and bandgap determination of GaAs(110).
Jäger, N. D.
Weber, E. R. / Urban, K. / Ebert, P.
Mikrostrukturforschung; IFF-IMF
Physical review / B, 67 (2003) S. 1-10
College Park, Md. APS 2003
Journal Article
Kondensierte Materie
Physical Review B 67
Get full text
Please use the identifier: in citations.
Please use the identifier: in citations.
Scanning tunneling microscopy and spectroscopy measurements on the GaAs(110) surface with complementary theoretical calculations are performed to clarify the effects involved in the tunneling of unpinned semiconductor surfaces. We show that the flatband and tip-induced band bending as well as equilibrium conditions are insufficient to describe the effects involved. Instead, carrier dynamics and conservation of momentum of the tunneling electrons need to be taken into account for a complete description of the contributions of the valence or conduction band states. The results allow us to understand the unique properties needed to achieve the atom-selective imaging observed on these surfaces as well as the determination of the band gap energy.