Bormann, I. and Brunner, K. and Hackenbuchner, S. and Riedl, H. and Schmult, Stefan and Wegscheider, Werner and Abstreiter, Gerhard
Long relaxation times of holes in Si/SiGe quantum cascade structures with a diagonal intersubband transition.
Physica E Low-dimensional Systems and Nanostructures 21 (2-4), pp. 779-782.
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In this work we investigate experimentally and theoretically the feasibility to enhance the nonradiative lifetime of the upper heavy hole state in Si/SiGe quantum cascade (QC) structures within a diagonal transition design. The problem of fast nonradiative optical phonon scattering makes it impossible to achieve population inversion with recently demonstrated Si/SiGe QC mid-infrared emitter ...
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