Cyclotron–interface phonon resonance line-width in asymmetric semiparabolic quantum wells. (May 2021) - Quynh Huong, Le Thi
Abstract: In this study, we investigated the cyclotron–interface phonon resonance line-width in GaAs/AlAs asymmetric semiparabolic quantum wells when electrons are scattered by symmetric (antisymmetric) interface optical phonons. The operator projection and profile methods were employed to calculate the expressions for the absorption power and the full width at half maximum (FWHM), respectively. We found that the electron–interface phonon interactions by the antisymmetric modes are weaker than those by the symmetric modes under all phonon emission and absorption cases. In addition, the FWHM is more dominant for interface phonon absorption compared with that for interface phonon emission. The interface optical phonon modes at the resonance peak with a lower-photon frequency are much more important for electron–interface optical phonon scattering than those at the resonance peak with a higher-photon frequency. Our results are consistent with previously reported experimental data. Highlights: Cyclotron–interface phonon resonance line-width in asymmetric semiparabolic QWs. Electron–interface phonon (EIP) interaction weaker in antisymmetric modes. EIP interaction more dominant for phonon absorption than phonon emissions. EIP interaction dependent on frequency of semiparabolic confinement potential. Contribution of interface optical phonons significant at low photon frequencies.