Regensburg 2002 – scientific programme

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O: Oberflächenphysik

O 37: Rastersondentechniken (II)

O 37.1: Talk

Friday, March 15, 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.