Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
71 (1992), S. 769-772
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A new approach for enhancing the exciton absorption and increasing the saturation limit in quantum wells (QWs), using tensile strain, is proposed. Because of the valence-band mixing in a strained QW, the in-plane hole mass can become very large or negative. This leads to a heavy electron-hole reduced mass (exciton mass), and therefore to a small exciton radius. Exciton absorption is substantially increased because of the increased electron-hole overlap probability in these small-radius excitons. The effects of saturation are also substantially reduced because of decreased charge-screening effects for small-radius excitons and because the rapid dispersal of the photon-generated excitons reduces the Pauli exclusion effect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.351341
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