title: The splitting of the electromagnon mode in conically spiral multiferroic magnets.
abstract: In this paper, we study conically spiral multiferroic magnets with coupled magnetic and ferroelectric orders. By generalizing the spin-current model, we study spin wave excitations and electromagnons. We find that the electromagnon mode will split into two branches with different dispersions in an (external or internal) magnetic field. We apply our theory to some multiferroic materials and find that the results qualitatively agree with recent experiments. We also make predictions for new experiments.
authors.affiliation: Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhou
authors.forename: You-Quan
authors.initials: YQ
authors.lastname: Li