title: Chiral order and electromagnetic dynamics in one-dimensional multiferroic cuprates.
abstract: We show by unbiased numerical calculations that the ferromagnetic nearest-neighbor exchange interaction stabilizes a vector spin chiral order against the quantum fluctuation in a frustrated spin-1/2 chain relevant to multiferroic cuprates, LiCu2O2 and LiCuVO4. Our realistic semiclassical analyses for LiCu2O2 resolve controversies on the helical magnetic structure and unveil the pseudo-Nambu-Goldstone modes as the origin of experimentally observed electromagnons.
authors.affiliation: Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Furukawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Sato
authors.forename: Shigeki
authors.initials: S
authors.lastname: Onoda