Intersubband and intrasubband electron scattering by acoustic-phonons in quantum wells

摘要

We study the intersubband and intrasubband electron scattering by acoustic-phonons in quantum wells by comparing the cyclotron-resonance (CR) full-width at half-maximum (FWHM) when without intersubband transitions with that when having intersubband transitions in quantum-well structure due to electrons-acoustic phonons scattering. Using operator projection technique, the expressions for CR magneto-optical absorption powers (MOAPs) are obtained. Using graphical and numerical method, we obtain the dependence of the MOAPs on the photon energy, temperature, quantum-well width, and external magnetic field. We obtain the FWHM as profile of the curve based on the profile technique. The FWHM is calculated for both when without intersubband transitions and when having intersubband transitions. The influence of the temperature, external magnetic field, and well width on the FWHM have been considered and discussed. The results for the CR-peaks FWHM in the case without intersubband transitions are compared with those in the case having inter-subband transitions. In addition, the contribution of acoustic phonons in the range of low- and high-temperatures have also been considered and compared.