Conductance of a STM contact on the surface of a thin film

Details Conductance of a STM contact on the surface of a thin film Conductance of a STM contact on the surface of a thin film

2012-01-15

arxiv.org/abs/1201.3086v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 5 figures

Scientific paper

The conductance of a contact, having a radius smaller than the Fermi wave length, on the surface of a thin metal film is investigated theoretically. It is shown that quantization of the electron energy spectrum in the film leads to a step-like dependence of differential conductance G(V) as a function of applied bias eV. The distance between neighboring steps in eV equals the energy level spacing due to size quantization. We demonstrate that a study of G(V) for both signs of the voltage maps the spectrum of energy levels above and below Fermi surface in scanning tunneling experiments.

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