Two-photon induced magneto-optical absorption in finite semi-parabolic quantum wells

• Published in: Superlattices and microstructures 2019-06, Vol.130, p.446-453
• Main Authors: Tung, Luong V., Lam, Vo T., Bau, Nguyen Q., Huyen, Pham T.K., Phuc, Huynh V., Nguyen, Chuong V.
• Format: Article
• Language: English
• Subjects: Electron–phonon interaction; FWHM; Magneto-optical properties; Quantum wells; Two-photon process
• ISSN: 0749-6036; 1096-3677
• DOI: 10.1016/j.spmi.2019.05.014

We theoretically study the magneto-optical absorption in a GaAs/Ga1−sAlsAs finite semi-parabolic quantum well where the two-photon process and electron–LO-phonon interaction have been included. The energy separation increases with Al-concentration and the field but decreases with the well-width. The peaks positions of the magneto-optical absorption coefficients (MOAC) present a blue-shift with Al-concentration and the magnetic field, a red-shift with the well-width, but is independent of the temperature. The MOAC peaks intensities increase monotonically with the field and temperature but are the non-monotonic functions of Al-concentration and well-width. The full-width at half-maximum (FWHM) decreases with the well-width but increases with all other parameters. The T-dependent FWHM is found to be in good agreement with previous theoretical and experimental results. Moreover, we found two rules describing the Al-concentration and the well-width dependent FWHM which require an experimental work to verify its correctness. •Two-photon induced magneto-optical absorption in finite SPQW is studied.•The two-photon process occurs strongly enough to observe.•The resonant peaks caused by the emission phonon process are observed significantly.•MOAC and FWHM are significantly affected by Al-concentration, well-width, temperature, and magnetic field.•Rules describing the Al-concentration and the well-width dependent FWHM are found.