Local Quantum Criticality of a One-Dimensional Kondo Insulator Model

TL;DR

This paper investigates the quantum critical behavior in a one-dimensional Kondo insulator model, revealing local quantum criticality at the transition point through density-matrix renormalization group analysis.

Contribution

It demonstrates the occurrence of local quantum criticality in an insulator-insulator transition without Fermi surface change, using unbiased numerical methods.

Findings

Local Kondo physics becomes critical at the magnetic transition.

Quantum fluctuations influence the nature of the quantum critical point.

Evidence for local quantum criticality in an insulator-insulator transition.

Abstract

The continuous quantum phase transition and the nature of quantum critical point (QCP) in a modified Kondo lattice model with Ising anisotropic exchange interactions is studied within the density-matrix renormalization group algorithm. We investigate the effect of quantum fluctuations on critical Kondo destruction QCP, by probing static and dynamic properties of the magnetic order and the Kondo effect. In particular, we identify that local Kondo physics itself becomes critical at the magnetic phase transition point, providing unbiased evidences for local quantum criticality between two insulators without resorting to the change of Fermi surface.