Influence of phonon confinement on the optically-detected electrophonon resonance linewidth in rectangular quantum wires

We investigate the influence of phonon confinement on the optically-detected electrophonon resonance (ODEPR) effect and ODEPR linewidth in rectangular quantum wires (RQW). The ODEPR conditions as functions of the wire’s size and the photon energy are also obtained. The splittings of ODEPR peaks caused by the confined phonon are discussed. The numerical result for a specific RQW shows that in the two cases of confined and bulk phonons, the linewidth decreases with increasing wire size and increases with increasing temperature. Furthermore, in the small range of the wire’s size (L ≤ 40 nm), phonon confinement plays an important role and cannot be neglected in reaching the ODEPR linewidth.