SEQUENTIAL EXCITED-TO-EXCITED STATES RESONANT-TUNNELING AND ELECTRIC-FIELD DOMAINS IN LONG-PERIOD SUPERLATTICES

The sequential excited-to-excited state resonant tunneling effect was observed in weakly coupled long period superlattices resulting in addi tional negative differential conductivity resonances in multistable cu rrent-voltage characteristics. The results obtained show the evidence of the highly nonequilibrium distribution of carriers over subbands wi th energies below the optical phonon energy in SL. A new type of elect ric field domain due to resonant tunneling between excited subbands in adjacent wells is considered, and experimental evidence of such a dom ain existence is given. (C) 1997 American Institute of Physics.