INTERSUBBAND COLLECTIVE SPIN-DENSITY AND CHARGE-DENSITY EXCITATIONS IN A SYSTEM OF 2D ELECTRONS IN THE QUANTUM HALL-EFFECT REGIME

Collective intersubband spin-and charge-density excitations in a syste m of 2D electrons and the dependence of the excitations on the perpend icular magnetic field are investigated by the inelastic light scatteri ng method. Magnetooscillations of the energies of collective excitatio ns are found, and it is shown that they are observed in the quantum Ha ll effect regime. The energy of the direct Coulomb interaction of thr electrons and its oscillatory variation as a function of the perpendic ular magnetic field are measured directly from the energy splitting of the spin and charge excitations. (C) 1998 American Institute of Physi cs.