Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 24, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/24/8/084001
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Funding
- GAAV [M100100904]
- GACR [204/10/0952, 202/09/0545, P204/11/P578]
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The relation between the tunnelling current It and the interaction energy/force E in an atomic-scale contact is discussed in the framework of a theoretical model established here. According to our model, we predict the existence of two characteristic scaling regimes, where the tunnelling current is either proportional to the interaction energy, I-t similar to E, or to the square of the interaction energy, I-t similar to E-2. We show that the existence of a given regime is basically controlled by two parameters: (i) the energy degeneracy Delta and (ii) the hopping t between electronic levels involved in the interaction process. In addition, we discuss the validity of the Bardeen method to determine the tunnelling current in the short tip-sample distances.
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