Europhys. Lett.
Volume 67, Number 6, September 2004
Page(s) 1031 - 1037
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 September 2004
Europhys. Lett., 67 (6), pp. 1031-1037 (2004)
DOI: 10.1209/epl/i2004-10153-2

Electron-phonon coupling in the two-phonon mode ternary alloy $\chem{Al_{0.25}In_{0.75}As/Ga_{0.25}In_{0.75}As}$ quantum well

C. Faugeras1, G. Martinez1, F. Capotondi2, 3, G. Biasiol2 and L. Sorba2, 3

1  Grenoble High Magnetic Field Laboratory, Max Planck Institut für Festkörperforschung and Centre National de la Recherche Scientifique BP 166, F-38042 Grenoble Cedex 9, France
2  NEST-INFM and Laboratorio Nazionale TASC-INFM Area Science Park, I-34012 Trieste, Italy
3  Dipartimento di Fisica, Università di Modena e Reggio Emilia I-41100 Modena, Italy

(Received 24 March 2004; accepted in final form 22 July 2004)

We have investigated the infrared transmission of a two-dimensional electron gas (2DEG) confined in a $\chem{Al_{0.25}In_{0.75}As/Ga_{0.25}In_{0.75}As}$ single quantum well in order to study the electron optical phonon interaction in a two-phonon mode system. Infrared transmission experiments have been performed in both the perpendicular Faraday (PF) and tilted Faraday (TF) configurations for which the growth axis of the sample is tilted with respect to the incident light propagation direction and to the magnetic-field direction. The experimental results lead to question the validity of the concept of polaron mass in a real material.

78.66.Fd - III-V semiconductors.
71.38.-k - Polarons and electron-phonon interactions.
78.67.-n - Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures.

© EDP Sciences 2004