Altermagnons at the metal-insulator transition

TL;DR

This paper uses slave-boson theory to study spin susceptibilities and magnon behavior across the metal-insulator transition in a Hubbard model on a checkerboard lattice, revealing a crossover in magnon dynamics.

Contribution

It introduces a formalism for quantitatively describing collective spin dynamics in correlated altermagnets across the transition.

Findings

Uncovered a crossover from dissipation to coherent chiral magnon modes.

Tracked magnon dispersion and lifetime renormalization across the transition.

Provided a framework for describing spin dynamics in altermagnetic materials.

Abstract

By means of slave-boson theory for the Hubbard model on the checkerboard lattice, we calculate dynamical altermagnetic spin susceptibilities from the metallic to the Mott-insulating regime. We track magnon dispersion and lifetime renormalization, allowing us to uncover a crossover from a chirality-selective dissipation of magnon modes to coherent yet strongly deformed chiral magnon branches across the metal insulator transition. Our formalism lends itself to a quantitative description of collective spin dynamics in correlated altermagnets.