We present a large-N theory for the differential conductance, dI/dV, in Kondo systems measured via scanning tunneling spectroscopy. We demonstrate that quantum interference between tunneling processes into the conduction band and into the magnetic f-electron states is crucial in determining the experimental Fano lineshape of dI/dV. This allows one to uniquely extract the Kondo coupling and the ratio of the tunneling amplitudes from the experimental dI/dV curve. Finally, we show that dI/dV directly reflects the strength of the antiferromagnetic interaction in Kondo lattice systems.
@article{arxiv.1001.4530,
title = {Differential Conductance and Quantum Interference in Kondo Systems},
author = {Jeremy Figgins and Dirk K. Morr},
journal= {arXiv preprint arXiv:1001.4530},
year = {2012}
}