Abstract
Photocurrent measurements have been performed on a quantum cascade detector structure under strong magnetic field $B$ applied parallel to the growth axis. The photocurrent shows oscillations as a function of $B$. In order to describe this behavior, we have developed a rate equation model. The interpretation of the experimental data supports the idea that an elastic scattering contribution plays a central role in the behavior of these structures. We present a calculation of the electron lifetime versus magnetic field which suggests that impurities scattering in the active region is the limiting factor. These experiments lead to a better understanding of these complex structures and identify key parameters to optimize them further.
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