Electronic Properties of a Semiconductor Superlattice. III. Energy Levels and Transport in Magnetic Fields

Abstract

Energy Levels and conductivities are calculated in a GaAs–Al_xGa_1−xAs superlattice in magnetic fields applied normal to the superlattice direction. Effects of intersubband mixings are shown to be important and modify the level structure considerably especially in strong magnetic fields. The results are compared with recent experiments of Chang et al. and a reasonable agreement is obtained if an electron concentration slightly higher than that determined experimentally is assumed. Transport in a model system with weak interlayer couplings is also discussed.