The Fano effect in the point contact spectroscopy of heavy electron materials

Abstract

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.

arXiv comment5 pages, 3 figures. A microscopic derivation for the Fano effect is included

References in corpus (9)

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• Observation of the hybridization gap and Fano resonance in the Kondo lattice URu2Si2
• Hybridization wave as the 'Hidden Order' in URu${}_2$Si${}_2$
• Tunneling into clean Heavy Fermion Compounds: Origin of the Fano Lineshape
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• Point-contact spectroscopy in heavy-fermion superconductors
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• Quantum critical scaling and fluctuations in Kondo lattice materials
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• Two-channel point-contact tunneling theory of superconductors
• A predictive standard model for heavy electron systems
• Spin-polarized supercurrent through the van der Waals Kondo lattice ferromagnet Fe${}_3$GeTe${}_2$
• The surface density of states of layered {\it f}-electron materials
• An emerging global picture of heavy fermion physics
• Hybridization oscillation in the one-dimensional Kondo-Heisenberg model with Kondo holes
• Hybridization-Controlled Pseudogap State in the Quantum Critical Superconductor CeCoIn5
• Possible Fano effect and suppression of Andreev reflection in La${}_3$Ni${}_2$O${}_7$
• Universal behavior in the Nernst effect of heavy fermion materials
• Spatial interferences in the electron transport of heavy fermion materials
• Tunneling in heavy-fermion junctions
• Tunneling limit of heavy-fermion point contacts
• Signatures of Kondo-lattice behavior in the two-dimensional ferromagnet Fe${}_3$GeTe${}_2$