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Direct observation of depolarization shift of the intersubband resonance

Direkte Beobachtung der Depolarisationsverschiebung von Untersubband-Resonanzen
: Graf, S.; Sigg, H.; Köhler, K.; Bächtold, W.


Physical review letters 84 (2000), Nr.12, S.2686-2689
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer IAF ()
III-V semiconductors; III-V Halbleiter; quantum wells; Quantenfilme; optical measurements; optische Messungen

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.