RESONANT-TUNNELING IN DOUBLE-BARRIER HETEROSTRUCTURES WITH AN ACCUMULATION LAYER

Two modes of electron gas injection in resonant tunnelling through GaA s/AlGaAs double-barrier heterostructures were revealed while studying their current-voltage characteristics. Examining peculiarities of the characteristics within the temperature range 4-350 K and under a high magnetic field, we were able to distinguish the contribution to resona nt tunnelling of ballistic electrons injected from a three-dimensional electron gas in the emitter contact and that of electrons injected fr om a two-dimensional electron gas in the accumulation layer formed nea r the emitter barrier.