Journal
PHYSICA SCRIPTA
Volume T162, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0031-8949/2014/T162/014014
Keywords
nonparabolicity; quantum well; quantum cascade laser; transfer matrix method
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Funding
- Ministry of Education, Science and Technological Development (Republic of Serbia) [III 45010]
- NATO SfP Grant [984068]
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We analyze the influence of conduction-band nonparabolicity on bound electronic states in the active region of a quantum cascade laser (QCL). Our model assumes expansion of the conduction-band dispersion relation up to a fourth order in wavevector and use of a suitable second boundary condition at the interface of two III-V semiconductor layers. Numerical results, obtained by the transfer matrix method, are presented for two mid-infrared GaAs/Al0.33Ga0.67As QCL active regions, and they are in very good agreement with experimental data found in the literature. Comparison with a different nonparabolicity model is presented for the example of a GaAs/Al0.38Ga0.62As-based mid-IR QCL. Calculations have also been carried out for one THz QCL structure to illustrate the possible application of the model in the terahertz part of the spectrum.
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