Dynamic phase diagram of dc-pumped magnon condensates

TL;DR

This paper investigates the nonlinear dynamics and damping effects on magnon condensates in ferromagnets, revealing the conditions for phase transitions like swasing and Bose-Einstein condensation through a detailed phase diagram.

Contribution

It introduces a comprehensive dynamic phase diagram accounting for damping and interactions, highlighting the continuous and hysteretic transitions of magnon condensates.

Findings

Stable magnon condensates emerge with damping and interactions.

Hysteretic transitions occur in the phase diagram.

Continuous onset of condensates is demonstrated.

Abstract

We study the effects of nonlinear dynamics and damping by phonons on a system of interacting electronically pumped magnons in a ferromagnet. The nonlinear effects are crucial for constructing the dynamic phase diagram, which describes how "swasing" and Bose-Einstein condensation emerge out of the quasiequilibrated thermal cloud of magnons. We analyze the system in the presence of magnon damping and interactions, demonstrating the continuous onset of stable condensates as well as hysteretic transitions.