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.

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

References in corpus (6)

• Andreev Reflection in Heavy-Fermion Superconductors and Order Parameter Symmetry in CeCoIn_5
• Universal Behavior in Heavy Electron Materials
• Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn_5
• Anomalous thermopower and Nernst effect in $\mathrm{CeCoI}{\mathrm{n}}_5$: entropy-current loss in precursor state
• Two-fluid behavior of the Kondo lattice in the 1/N slave boson approach
• Point-contact Andreev reflection spectroscopy of heavy-fermion-metal/superconductor junctions

Cited by in corpus (16)

• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Many-body Resonance in a Correlated Topological Kagome Antiferromagnet
• Point-contact spectroscopy in heavy-fermion superconductors
• Andreev reflection and order parameter symmetry in heavy-fermion superconductors: the case of CeCoIn${}_5$
• Magnetic excitations in Kondo liquid: Superconductivity and Hidden Magnetic Quantum Critical Fluctuations
• Anomalous Hall effect in heavy electron materials
• 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${}_2$
• An emerging global picture of heavy fermion physics
• Possible Fano effect and suppression of Andreev reflection in La${}_3$Ni${}_2$O${}_7$
• Hybridization-Controlled Pseudogap State in the Quantum Critical Superconductor CeCoIn5
• Universal behavior in the Nernst effect of heavy fermion materials
• Tunneling limit of heavy-fermion point contacts
• Signatures of Kondo-lattice behavior in the two-dimensional ferromagnet Fe${}_3$GeTe${}_2$