Nonlinear optical absorption via two-photon process in GaAs/Ga1−xAlxAsGaAs/Ga1−xAlxAs quantum well

• Nonlinear optical absorption phenomenon is studied via investigating the PACR effect.
• The two-photon absorption process is included in the analytical results.
• PACR behavior is strongly affected by the hydrostatic pressure, aluminum concentration, and temperature.
• There is a clear monotonic behavior of the resonant peaks and half-width as functions of these quantities.

We study the combined effects of hydrostatic pressure, aluminum concentration, well width, and temperature on linear and nonlinear optical absorption spectrum in GaAs/Ga1−xAlxAsGaAs/Ga1−xAlxAs quantum well under the applied magnetic field via investigating the phonon-assisted cyclotron resonance (PACR) effect. Our result shows that the optical absorption behaviors are affected strongly by hydrostatic pressure, aluminum concentration, temperature and well width. Besides, the present work discovers a clear monotonic behavior of the resonant peaks and the half-width as functions of the pressure, concentration, temperature or well width in both one- and two-photon absorption processes.