Browsing Department of Physics by Author "Kleber, Markus"

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Propagator theory of scanning tunneling microscopy

Bracher, Christian; Rıza, Mustafa; Kleber, Markus (American Physical Soc, 1997)

We develop a quantum mechanical scattering theory for electrons which tunnel out of (or into) the tip of a scanning tunneling microscope. The method is based on propagators (or Green functions) for quasistationary scattering ...
A simple adsorbate model in STM

Bracher, Christian; Rıza, Mustafa; Kleber, Markus (Springer-Verlag, 1998)

We discuss a novel source-theoretical description of the STM based on the concepts of quantum-mechanical scattering theory. As an application of the formalism, we study how the presence of a crystalline adsorbate layer ...
Variational approach to the tunneling-time problem

Bracher, Christian; Rıza, Mustafa; Kleber, Markus (AMER PHYSICAL SOC, 1999)

Tunneling problems are characterized by different quantum time scales of motion. In this paper, we identify a tunneling time scale, which is based on a simple variational principle. The method utilizes the stationary e ...