Uncovering non-Fermi-liquid behavior in Hund metals: critical behavior of a three-orbital Kondo model

ORAL

Abstract

When using dynamical mean field theory (DMFT) to study Hund metals, one arrives at self-consistent impurity models in which bath and impurity both have spin and orbital degrees of freedom. If these are screened at different energy scales, TKsp < TKorb, the intermediate energy window is governed by a novel non-Fermi-liquid (NFL) fixed point, involving screened orbital degrees of freedom weakly coupled to an unscreened local spin. Here we characterize the corresponding NFL behavior in detail for a 3-orbital Kondo model, tuned such that the NFL energy window is very wide. We find excellent agreement between conformal field theory (CFT) predictions and numerical renormalization group (NRG) results.

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Presenters

  • Elias Walter

    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University of Munich, Germany

Authors

  • Elias Walter

    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University of Munich, Germany

  • Katharina M Stadler

    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University of Munich, Germany

  • Seung-Sup B. Lee

    Ludwig-Maximilians-Universität München, Munich, Germany, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University of Munich, Germany

  • Yilin Wang

    Department of Condensed Matter Physics and Materials Science, Upton, New York 11973, USA, Brookhaven National Laboratory, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY

  • Gabriel Kotliar

    Rutgers University and Brookhaven National Laboratories, Department of Condensed Matter Physics and Materials Science, Upton, New York 11973, USA, Brookhaven National Laboratory, Rutgers University, New Brunswick, Brookhaven National Laboratory, Department of Physics, Rutgers University, Physics, Rutgers University, Rutgers University, New Jersey, USA, Physics and Astronomy Department, Rutgers University, Department of Physics and Astronomy, Rutgers University, NJ

  • Andreas Weichselbaum

    Brookhaven National Laboratory, Brookhaven National Laboratory, New York, USA, Brookhaven National Lab, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, NY

  • Jan Von Delft

    Arnold Sommerfeld Centre for Theoretical Physics, Ludwig-Maximilians University, Ludwig-Maximilians-Universität München, Munich, Germany, University of Munich, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-University of Munich, Germany