Spontaneous non-equilibrium magnetism via "Berryogenesis" in driven electronic systems

TYPECondensed Matter Seminar
Speaker:Mark Rudner
Affiliation:Niels Bohr Institute
Time:14:30 - 15:30
Location:Lidow Nathan Rosen (300)

Spontaneous symmetry breaking is central to the description of interacting phases of matter. In this talk I will discuss a novel type of collective mode symmetry breaking transition in which a driven interacting system subject to a time-reversal symmetric driving field can spontaneously magnetize. 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.  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 magnetism with present-day capabilities