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2000
Journal Article
Titel
Direct observation of depolarization shift of the intersubband resonance
Alternative
Direkte Beobachtung der Depolarisationsverschiebung von Untersubband-Resonanzen
Abstract
We have studied the intersubband resonance of GaAs/AlGaAs multi-quantum-well systems by comparing photon drag and absorption spectra obtained by in-plane photocurrent and photoconduction measurements. The peak absorption at room temperature is found to be blueshifted from the photon drag resonance by as much as 33 cm(exp -1). We argue that this difference gives directly the depolarization shift. since the resonant photon drag current is driven by the Doppler effect, which is a k-vector dependent single particle process.
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