Abstract

Resonant Raman Spectroscopy, modulated by a local electric field was used to resolve quasi continuum and resonant states of an asymmetric well structure. The local electric field was generated via photo-induced intersubband excitation of carriers from one well to the other. We show that while bound states and continuum resonant states above the barrier of the quantum well are Stark shifted by the application of the local electric field, quasi-continuum levels above the barrier are not shifted. This method allows us to resolve the various types of energy levels that form the quantum well continuum of states.

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