研究目的
Investigating the effects of varying doping concentration and applied electric field on the intersubband-related optical absorption and relative refractive index change coefficients in modulation-doped GaAs/AlxGa1?xAs double quantum wells.
研究成果
The study demonstrates that it is possible to tune the absorption coefficient resonant energy, as well as the relative refractive index change, with externally applied electric field and that their amplitudes noticeably depend on the considered donor impurity density. The self-consistent solution is essential for an accurate physical description of the seeded impurity volume densities present in real devices.
研究不足
The treatment is suitable to consider the general problem with different wells and barrier sizes, although the barrier width should preferably be small enough as to allow for an effective inter-well coupling.
1：Experimental Design and Method Selection:
The study involves solving the Schr?dinger and Poisson equations self-consistently within the framework of the effective-mass and parabolic band approximations to calculate the allowed energy levels and corresponding wave-functions. The optical coefficients are evaluated using the compact density matrix formalism within an iterative procedure.
2：Sample Selection and Data Sources:
The system consists of a symmetric double rectangular GaAs/AlxGa1?xAs QW, with well width regions Lwl and Lwr measuring 10 nm and central barrier width Lb = 2 nm. Donor impurities density values are considered.
3：List of Experimental Equipment and Materials:
Not explicitly mentioned in the provided text.
4：Experimental Procedures and Operational Workflow:
The self-consistent procedure involves recursive solving of the Schr?dinger and Poisson equations to obtain the electronic structure, energy levels, and eigenfunctions for different values of the applied electric field strength F.
5：Data Analysis Methods:
The optical absorption coefficients and relative refractive index changes are calculated based on the obtained electronic structure and dipole matrix elements.
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