Resonant tunneling through single layer heterostructures

A new resonant tunneling process is discussed theoretically. The process relies on elastic intervalley transfers between different band minima, e.g., between Γ and X minima in a GaAs-AlAs system. Single layer GaAs-AlAs-GaAs heterostructures are analyzed. An effective mass envelope function approach is used, and a delta-function transfer potential at heterointerfaces is employed. A resonance in the transmission coefficient is clearly seen, which gives rise to a negative differential resistance region in the current-voltage characteristic.