Resonance Magnetophonon Inter Sous-Bandes dans les Structures Unipolaires à Cascades Quantiques

Abstract : This thesis presents a study of intersubband lifetime of electrons in unipolar quantum wells under strong magnetic field. We evidenced quantum oscillations of the intersubband lifetime as a function of magnetic field named Intersubband Magnetophonon Resonance. The oscillations, periodic with reciprocal of magnetic field, are detected by measuring GaAs/GaAlAs quantum cascade lasers emission intensity under pulsed magnetic field up to 60T. This experiment provides a direct evidence of the “phonon bottleneck” effect by the detection of periodic blockage of the emission of longitudinal optic phonons by excited electrons. We also evidenced Intersubband Magnetophonon oscillations in the magnetoresistance of the laser structure. From a spectral analysis of IMPR oscillations we obtain a spectroscopic identification of phonon modes involved in the intersubband energy relaxation mechanisms. We identified AlAs LO phonons contribution in samples having higher Al content in their barrier but could not evidence confined phonon modes. Finally, the intersubband lifetime as a function of magnetic field is derived from the laser threshold variation. The lifetime is then compared respectively with predictions of strong electron-phonon coupling model (magneto-polarons) and weak coupling model which takes into account broadening of energy levels.
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Contributor : Oleksiy Drachenko <>
Submitted on : Thursday, January 13, 2005 - 9:55:53 AM
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Oleksiy Drachenko. Resonance Magnetophonon Inter Sous-Bandes dans les Structures Unipolaires à Cascades Quantiques. Physique Atomique [physics.atom-ph]. Université Paul Sabatier - Toulouse III, 2004. Français. ⟨tel-00008037⟩

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