Quantum-Well Charge Density in Double-Barrier Diodes Measured by Differential Absorption Spectroscopy

Resonant tunneling has attracted a great deal of attention as both a novel physical phenomena and a potential basis for useful devices. Nevertheless, issues like charge accumulation, sequential or coherent transport, and tunneling times are unresolved. The technique of Differential Absorption Spectroscopy (DAS) can address these issues. We report here its first application to double barrier diodes (DBDs).