Stark ladders in strongly coupled GaAs-AlAs superlattices

Abstract

The energy spectrum of a superlattice in the presence of an electric field is calculated using the split time scheme. It is shown that even for a low field two interpenetrating Stark ladders exist in a GaAs-AlAs superlattice and the spacing between the energy levels in each of the ladders is eEd. When the external field is increased the number of ladders with the same period eEd is also increased.