INTERFERENCE PHENOMENA DUE TO INTERVALLEY MIXING EFFECTS IN THE MULTIVALLEY DOUBLE-BARRIER STRUCTURES

The transmission spectra of the multivalley double-barrier structures for various quantum-well widths are investigated within an antibonding -orbital model. We found some interesting interference phenomena due t o the intervalley mixing effect: For each quantum-well width, the tran smission spectrum exhibits a pair of closely spaced resonance peaks; t he energy separation between the two resonance peaks and the ratio of the two resonance widths are oscillatory functions of the quantum-well width; and the energy separation between the two resonance peaks may be changed significantly by applying a voltage difference across the d ouble-barrier structure when the energy separation at zero bias is sma ll. We also demonstrated that these interference phenomena can be obse rved by analyzing the current-voltage characteristics of the multivall ey double-barrier structures.