Model for Ferromagnetic Quantum Critical Point in a 1D Kondo Lattice

TL;DR

This paper investigates a one-dimensional Kondo lattice with ferromagnetic interactions, revealing a quantum critical point characterized by Kondo breakdown and a gapless charged mode, supported by bosonization and large-N methods.

Contribution

It introduces a quasi-one-dimensional ferromagnetic Kondo lattice model demonstrating a local quantum critical point with Kondo breakdown, using advanced analytical techniques.

Findings

Identification of a Fermi liquid and magnetic phase separation.

Presence of a local quantum critical point governed by Kondo breakdown.

Discovery of a gapless charged mode at the critical point.

Abstract

Motivated by recent experiments, we study a quasi-one dimensional model of a Kondo lattice with Ferromagnetic coupling between the spins. Using bosonization and dynamical large-N techniques we establish the presence of a Fermi liquid and a magnetic phase separated by a local quantum critical point, governed by the Kondo breakdown picture. Thermodynamic properties are studied and a gapless charged mode at the quantum critical point is highlighted.