Subband renormalization in the presence of a dense electron-hole plasma in a quantum well

We calculate the shrinkage of the gaps between the two lowest subbands in a quantum well induced by the presence of a photo-excited electron-hole plasma. The results are reported as a function of well width and plasma concentration. The reduction of the higher gaps is found to be almost as strong as...

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Bibliographic Details
Published in:Solid state communications 1991-11, Vol.80 (7), p.473-476
Main Authors: Bongiovanni, G., Staehli, J.L.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface and interface electron states
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Summary:We calculate the shrinkage of the gaps between the two lowest subbands in a quantum well induced by the presence of a photo-excited electron-hole plasma. The results are reported as a function of well width and plasma concentration. The reduction of the higher gaps is found to be almost as strong as that of the fundamental gap. The contribution of the so called ‘off-diagonal’ terms is shown to be important.
ISSN:0038-1098
1879-2766
DOI:10.1016/0038-1098(91)90053-X