Schwinger boson approach for the dynamical mean-field theory of the Kondo lattice

TL;DR

This paper introduces a Schwinger boson-based impurity solver for DMFT applied to the Kondo lattice, effectively capturing hybridization physics and reproducing key thermodynamic and transport behaviors across temperature regimes.

Contribution

The authors develop a novel large-N Schwinger boson approach as an impurity solver for DMFT, improving the modeling of the Kondo lattice by incorporating hybridization effects.

Findings

Qualitative agreement with rigorous calculations

Correct crossover from local moment to Fermi liquid behavior

Potential for integration with density functional theory

Abstract

We apply the dynamical large-$N$ Schwinger boson technique as an impurity solver for the dynamical mean-field theory (DMFT) calculations of the Kondo lattice model. Our approach captures the hybridization physics through the DMFT self-consistency that is missing in the pure Schwinger boson calculations with independent electron baths. The resulting thermodynamic and transport properties are in qualitative agreement with more rigorous calculations and give the correct crossover behavior over a wide temperature range from the local moment regime to the Fermi liquid. Our method may be further extended to combine with the density functional theory for efficient material calculations.