SUBBAND STRUCTURES AND INTERSUBBAND OPTICAL-TRANSITIONS IN LATERAL SURFACE SUPERLATTICES UNDER ELECTRIC-FIELDS

Subband structures of two-dimensional electronic gases modulated by lateral periodic potentials arise from periodically structured interfaces, such as those produced by the deposition of AlAs and GaAs fractional layers on (001) vicinal GaAs substrates under normally applied electric fields, are studied by variational numerical calculations. The results show that minigaps of electronic subbands, the density of states and the optical absorption peaks associated with electronic intersubband transitions of the systems depend sensitively on the applied electric fields.