Magnetoplasmon spectrum of a modulation-doped semiconductor superlattice with periodic defects

Abstract

The newly proposed modulation doped superlattice with periodic defects simulated by positive potential barriers in the quantum wells of the superlattice has been shown to feature minibands of controllable widths and separations, by adjusting the position and height of the barriers within the wells. We demonstrate that such interesting properties of the single-particle spectrum are correspondingly reflected in the magnetoplasmon excitations of the same structure. A self-consistent field RPA approach is employed here to examine the inter-subband and intra-subband magnetoplasmon spectra of the modulation doped superlattice, with particular attention given to the effects of the positive potential barrier (defect) on these collective charge density modes in a magnetic field.