Berryogenesis: self-induced Berry flux and spontaneous non-equilibrium magnetism

TL;DR

This paper introduces Berryogenesis, a novel non-equilibrium phase transition where driven multiband systems spontaneously generate Berry flux and magnetization through internal plasmonic feedback, even under symmetric driving conditions.

Contribution

It reveals a new mechanism for spontaneous magnetization via self-induced Berry flux in driven systems, expanding understanding of non-equilibrium phases in multiband materials.

Findings

Berryogenesis occurs above a critical driving amplitude.

The phase transition can be continuous or discontinuous.

Graphene devices are promising platforms for observing this phenomenon.

Abstract

Spontaneous symmetry breaking is central to the description of interacting phases of matter. Here we reveal a new mechanism through which a driven interacting system subject to a time-reversal symmetric driving field can spontaneously magnetize. We show that the strong internal ac fields of a metal driven close to its plasmon resonance may enable Berryogenesis: the spontaneous generation of a self-induced Bloch band Berry flux. The self-induced Berry flux supports and is sustained by a circulating plasmonic motion, which may arise even for a linearly polarized driving field. This non-equilibrium phase transition occurs above a critical driving amplitude, and may be of either continuous or discontinuous type. Berryogenesis relies on feedback due to interband coherences induced by internal fields, and may readily occur in a wide variety of multiband systems. We anticipate that graphene devices, in particular, provide a natural platform to achieve Berryogenesis and plasmon-mediated spontaneous non-equilibrium magnetization in present-day devices.