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 to the intervalley mixing effect: For each quantum-well width, the transmission spectrum exhibits a pair of closely spaced resonance peaks; the 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 double-barrier structure when the energy separation at zero bias is small. We also demonstrated that these interference phenomena can be observed by analyzing the current-voltage characteristics of the multivalley double-barrier structures.