RESONANCE FEATURES OF A 2-STATE MODEL

More complete heterostructure tunneling simulations often display unus ual resonance features. Unfortunately, the complexity of these models often obscures the physics behind such behavior. In order to better un derstand these features we study the transmission of a simple, yet qui te general, two-state scattering model. With this model we are able to reproduce all of the types of resonance behavior observed in multista te heterostructure tunneling simulations: resonances, antiresonances, and resonance-antiresonance pairs. We find that resonance-antiresonanc e pairs are possible when the incident state (state 1) is somewhat con fined, the other state (state 2) is well confined, and the magnitudes of the state-2 intrastate transmission and the state-1-state-2 interst ate transmission are both small. We also find that if the state-1 conf inement is not too strong and the state-1 and state-2 resonances coinc ide then an antiresonance (notch) in the transmission peak at the comm on resonance can occur. These results should aid interpretation of the transmission graphs predicted by more complete multistate heterostruc ture tunneling models.