CHARGE ACCUMULATION AND BAND EDGE IN THE DOUBLE BARRIER TUNNELING STRUCTURE

Due to various scattering processes, the wave function coherence is broken during transport in the double barrier resonant tunneling structure (DBRTS). Based on this coherence breakdown, local states are assumed to exist in the well region in DBRTS and the Schrodinger equation is solved self-consistently together with the Poisson equation. The properties of the charge accumulation in local states are investigated and presented as possible mechanisms to explain three sets of recent experimental results: (a) the redshift and broadening of photoluminescence and photoluminescence excitation peaks, (b) the peak in the specific capacitance-voltage spectrum at the resonance, and (c) the appearance/disappearance of the shoulder peak adjacent to the resonance peak in I-V spectra without/with an external capacitor connected in parallel to the DBRTS.