Non-Hermiticity Induced Universal Anomalies in Kondo Conductance

TL;DR

This paper explores how non-Hermiticity and strong correlations in open quantum systems lead to novel Kondo conductance phenomena, revealing universal anomalies and unconventional temperature-dependent behaviors.

Contribution

It introduces a physical setup for a non-Hermitian multichannel Kondo model and uncovers new fixed points and conductance behaviors driven by non-Hermiticity.

Findings

Identification of a non-Hermitian multichannel Kondo model with PT symmetry

Discovery of universal unconventional Kondo conductance behaviors

Observation of anomalous conductance upturn with increasing temperature

Abstract

Strong correlation, when combined with dissipation in open systems, can lead to a variety of exotic quantum phenomena. Here, we study nontrivial interplays between non-Fermi liquid behaviors emerging from strong correlation and non-Hermiticity arising from open systems. We propose a practical physical setup that realizes a non-Hermitian multichannel Kondo model. We identify a weak-coupling local moment fixed point and a strong-coupling non-Fermi liquid fixed point under PT symmetry, both are enriched by the non-Hermitian effect. Remarkably, universal unconventional Kondo conductance behaviors are found for both cases, which are distinct from all previously studied Kondo systems. Particularly, we show that an anomalous upturn of conductance could take place with increasing the temperature, originating from the interplay between non-Fermi liquid and non-Hermiticity. Our results identify a novel class of transport phenomena unrecognized before, driven by intertwined effects of correlation and dissipation.