title: Direct observation of depolarization shift of the intersubband resonance
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(-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.
authors.affiliation: Paul Scherrer Institut, Labor fur Mikro- und Nanotechnologie, CH-5232 Villigen-PSI, Switzerland.
authors.initials: S
authors.lastname: Graf
authors.initials: H
authors.lastname: Sigg
authors.initials: K
authors.lastname: Kohler
authors.initials: W
authors.lastname: Bachtold