“Spin waves, magnetoelastic modes, and classical wave condensation in yttrium-iron garnet” by Peter Kopietz (Goethe Universität Frankfurt)

Wednesday, November 15, 2017 - 4:00pm
Condensed Matter Journal Club

Although the magnetic insulator yttrium-iron-garnet (YIG) has been studied for many

decades both experimentally and theoretically, the experimental discovery of “Bose-Einstein"

condensation of magnons in YIG at room temperature has triggered renewed interest in

YIG. In my talk I describe recent theoretical eorts to understand the non-equilibrium

magnon dynamics in YIG and to nd a physical interpretation of room temperature “Bose-

Einstein" condensation of magnons in this material. I argue that this is a purely classical

phenomenon which should be called “Rayleigh-Jeans" rather than “Bose-Einstein" con-


PAB 4-330