Resonant response of a metallic nanoparticle by collective cyclotron oscillations of electrons and ions

A metal nanoparticle threaded by uniform magnetic field of an ambient matrix responding to an incident electromagnetic wave by collective cyclotron oscillations of electrons and ions is considered. The resonant frequencies of light-induced electron and ion cyclotron oscillations, gyromagnetic plasmons, are obtained followed by a brief discussion of testing these predictions by optical means.