INTERSUBBAND EXCITATIONS OF QUASI-ONE-DIMENSIONAL ELECTRON-SYSTEMS INA MAGNETIC FIELD

Intersubband excitation spectra of quasi-one-dimensional electron syst ems in quantum wires are calculated by the perturbation expansion with respect to the Coulmb interaction between electrons in the presence o f perpendicular magnetic fields. We find the peak structure at the upp er edge of spectra of the single-particle excitation, in addition to t he main peak corresponding to the magnetoplasmon. With increasing the magnitude of magnetic fields, this additional peak separates from the spectra of the single-particle excitation and the intensity of this pe ak is gradually decreased. We consider that the additional peak is con nected with the attractive interaction between electrons-which appears only in the presence of magnetic fields.