Phonon-induced magnetism

THz radiation allows for the controlled excitation of vibrational modes in molecules and crystals. We discuss the formation of magnetic moments and spin-phonon coupling. Dynamical multiferroicity features entangled dynamic orders: fluctuating electric dipoles induce magnetization. Hence, the material with paraelectric fluctuations can develop magnetic signatures if dynamically driven. We identify the paraelectric KTaO3 (KTO) as a prime candidate and provide computational estimates for dynamically induced magnetic moments [1]. We continue by showing that the circular motion of ions induce inertial effects on localized electrons. We deduce the resulting spin-phonon interaction as well as other inertial effects, like a dynamic Rashba effect [2].