Influence of phonon confinement on the optically detected magneto-phonon resonance line-width in quantum wells

• Absorption power is calculated in square quantum wells taking into account the phonon confinement effect.
• Optically detected magneto-phonon resonance line-width (ODMPRLW) as profiles of curves is determined.
• The ODMPRLW increases with increasing temperature and decreases with increasing well's width.
• The ODMPRLW in the case of confined phonons is greater than it is in the case of bulk phonons.

We investigate the influence of phonon confinement on the optically detected magneto-phonon resonance (ODMPR) effect and ODMPR line-width in quantum wells. The ODMPR conditions as functions of the well's width and the photon energy are also obtained. The shifts of ODMPR peaks caused by the confined phonon are discussed. The numerical result for the GaAs/AlAs quantum well shows that in the two cases of confined and bulk phonons, the line-width (LW) decreases with increasing well's width and increases with increasing temperature. Furthermore, in the small range of the well's width, the influence of phonon confinement plays an important role and cannot be neglected in reaching the ODMPR line-width.