Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-16
Phys. Rev. B 79, 241107(R) (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures. A microscopic derivation for the Fano effect is included
Scientific paper
10.1103/PhysRevB.79.241107
We show that Fano interference explains how point contact spectroscopy in heavy electron materials probes the emergence of the Kondo heavy electron liquid below the same characteristic temperature T* as that seen in many other experiments, and why the resulting measured conductance asymmetry reflects the universal Kondo liquid behavior seen in these. Its physical origin is the opening of a new channel for electron tunneling beyond that available from the background conduction electrons. We propose a simple phenomenological expression for the resulting Fano interference that provides a good fit to the experimental results for CeCoIn$_5$, CeRhIn$_5$ and YbAl$_3$, over the entire range of bias voltages, and deduce a life-time of the heavy quasiparticle excitations that agrees well with recent state-of-the-art numerical calculations.
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