Linear And Nonlinear Intersubband Optical Absorptions In Multiple Quantum Wells Under The External Fields

摘要

In this study, the effects of the external fields (electricand tilted magnetic fields) and well parameters on the optical absorptioncoefficients in GaAs/GaAlAs multiple (five) quantum wells under the appliedelectric and tilted magnetic fields has been investigated theoretically.Firstly, the energy eigenvalues and eigen functions of an electron confined inmultiple quantum wells are calculated by analytically from Schrödinger equationusing the transfer matrix method within the effective mass approximation,Secondly, the linear, nonlinear and total intersubband optical absorptions inGaAs/GaAlAs multiple quantum wells system are studied within the compact density-matrixapproach. It is shown that the parameters such as strenghts of the externalfields and θ-tilted angle values not only shift the peak positions inabsorption spectrum but also considerably modify their potential heights. Ingenerally, electronic and optical properties of the quantum wells are verysensitive to the applied external fields and well parameters. Therefore, we canconclude that the effect of the external fields can be used to tune and controlthe optical properties of interest in the range of the far-infraredelectromagnetic spectrum.