Tip apex charging effects in tunneling spectroscopy

Details Tip apex charging effects in tunneling spectroscopy Tip apex charging effects in tunneling spectroscopy

2009-11-23

arxiv.org/abs/0911.4278v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

26 pages, 12 figures

Scientific paper

The influence of charged STM tip on the electron transport through quantum states on a surface is studied both theoretically and experimentally. The current and the differential conductance calculations are carried out by means of the Green's function technique and a tight-binding Hamiltonian. It is shown that sharp STM tip is extra occupied and this additional charge breaks the conductance symmetry for positive and negative STM voltages. The experiment on Ag islands with two STM tips (blunt and sharp) confirms our theoretical calculations.

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