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Nonradiative relaxation times in diagonal transition Si/SiGe quantum cascade structures

Bormann, I. ; Brunner, Konrad ; Hackenbuchner, S. ; Abstreiter, Gerhard ; Schmult, Stefan ; Wegscheider, Werner
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Date of publication of this fulltext: 15 Dec 2009 08:51


Abstract

Here, we explore experimentally and theoretically the possibility to prolong the upper hole state nonradiative lifetime of Si/SiGe quantum cascade (QC) structures by using a spatially indirect diagonal transition between two SiGe quantum well ground states. With the recent observation of well resolved midinfrared electroluminescence from heavy hole intersubband transitions in Si/SiGe valence-band ...

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