Itinerant Antiferromagnetism in Infinite Dimensional Kondo Lattice

TL;DR

This paper uses advanced numerical methods to study itinerant antiferromagnetism in the Kondo lattice, revealing hybridized energy bands and the persistence of the Kondo effect across a quantum transition.

Contribution

It provides highly accurate numerical results for the Kondo lattice's spectral and order parameters, highlighting the nature of itinerant antiferromagnetism and the quantum transition.

Findings

Identification of hybridized energy bands in the Néel state

Degeneracy at the Brillouin zone boundary persists despite doubled unit cell

Antiferromagnetic transition occurs within the itinerant regime without localization

Abstract

Highly accurate numerical results for single-particle spectrum and order parameter are obtained for the magnetically ordered Kondo lattice by means of the dynamical mean-field theory combined with the continuous-time quantum Monte Carlo method. Hybridized energy bands involving local spins are identified in the N\'{e}el state as a hallmark of itinerant antiferromagnetism. At the boundary of the reduced Brillouin zone, the two-fold degeneracy remains in spite of the doubled unit cell. This degeneracy results if the molecular field felt by localized spins has identical magnitude and reversed direction with that of conduction electrons. The persistent Kondo effect is responsible for the behavior. The antiferromagnetic quantum transition occurs inside the itinerant regime, and does not accompany the itinerant-localized transition.