Regensburg 2002 – wissenschaftliches Programm
O 37.1: Vortrag
Freitag, 15. März 2002, 11:15–11:30, H36
Multiple-Scattering Theoretical Approach to Scanning Tunneling Spectroscopy — •Jürgen Henk, Jamal Berakdar, and Patrick Bruno — MPI für Mikrostrukturphysik, Halle (Saale)
The qualitative and quantitative theoretical description of scanning tunneling spectroscopy (STS) is usually based on the popular Tersoff-Hamann model. By simply relating the tunneling current to the spectral density of the sample, however, relevant properties of the tunneling through the tip-sample system are neglected.
Viewing electronic tunneling as a scattering process, we present a formulation of STS in terms of multiple-scattering theory which takes into account the tip-sample interaction. Further, electronic properties of the constituent systems can be obtained by ab-initio calculations. Besides the general formalism and its implementation in a spin-polarised relativistic layer-KKR scheme, we sketch results for prototypical systems – with a focus on features of the scattering-theoretical approach.