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Optical Studies of free and Acceptor-Bound Excitons in GaAs/AlGaAs Symmetric Coupled Double Quantum Well Structures

Published online by Cambridge University Press:  21 February 2011

Q.X. Zhao ,
P.O. Holtz ,
B. Monemar ,
B.O. Fimland  and
K. Johannessen
Q.X. Zhao
Affiliation:
Department of Physics and Measurement Technology, Linköping University S-581 83 Linköping, Sweden
P.O. Holtz
Affiliation:
Department of Physics and Measurement Technology, Linköping University S-581 83 Linköping, Sweden
B. Monemar
Affiliation:
Department of Physics and Measurement Technology, Linköping University S-581 83 Linköping, Sweden
B.O. Fimland
Affiliation:
Department of Physical Electronics, Norwegian Institute of Technology, N-7034 Trondheim, Norway
K. Johannessen
Affiliation:
SINTEF DELAB, N-7034 Trondheim, Norway.
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Abstract

Discrete peaks, due to the excited 2S state of the n=l symmetric heavy hole (hh) exciton, are observed in the photoluminescence excitation spectra of GaAs/AlGaAs coupled double quantum well (CDQW) samples. The observations of the 2S state allow a precise determination of 1S-2S splitting, and the experimental results show a good agreement with a simple calculation which is based on a model of fractional-dimension of the exciton state. The obtained values for the 1S-2S splitting are significantly reduced compared with the corresponding single (or multiple) quantum wells (QW). Central acceptors confined in CDQWs have also been studied. Due to built in electric fields, interwell and intrawell excitons bound to neutral acceptors are simultaneously observed in weakly coupled doped double QWs. The diamagnetic shift and binding energy of the bound excitons are similar to results of the single QW’s, while the diamagnetic shift of the free exciton differs from single QW’s.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 326: Symposium M – Growth, Processing, and Characterization of Semiconductor Heterostructures , 1993 , 383
Copyright
Copyright © Materials Research Society 1994

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References

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