Time-dependent Schwinger boson mean-field theory of supermagnonic propagation in 2D antiferromagnets

TL;DR

This paper uses time-dependent Schwinger boson mean-field theory to explore supermagnonic spin correlation propagation in 2D antiferromagnets, revealing a tunable effect influenced by magnons and quasi-bound states.

Contribution

It introduces a new theoretical framework to understand and control supermagnonic effects in 2D antiferromagnets, highlighting the role of lattice coordination and spin quantum number.

Findings

Supermagnonic spin correlation propagation can be tuned by lattice and spin parameters.

The competition between magnons and quasi-bound states determines supermagnonic effects.

The study provides insights for ultrafast spintronic applications.

Abstract

Understanding the speed limits for the propagation of magnons is of key importance for the development of ultrafast spintronics and magnonics. Recently, it was predicted that in 2D antiferromagnets, spin correlations can propagate faster than the highest magnon velocity. Here we gain deeper understanding of this supermagnonic effect based on time-dependent Schwinger boson mean-field theory. We find that the supermagnonic effect is determined by the competition between propagating magnons and a localized quasi-bound state, which is tunable by lattice coordination and quantum spin value $S$, suggesting a new scenario to enhance magnon propagation.