The spatial and energy-dependent fluctuations of the local density of states (LDOS) are calculated by means of a transfer matrix formalism for a model point contact (PC). It is shown that decreasing the size of the orifice the LDOS fluctuations become more and more pronounced in the region near to the orifice. As the Kondo temperature of a magnetic impurity is determined by the LDOS at the Fermi energy a broadening of the Kondo resonance is predicted for small metallic PC's in agreement with the results of recent measurements.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering