Photoluminescence and photoluminescence excitation studies on GaAs/Al0.25Ga0.75As asymmetric coupled double quantum well
Lee, D. H. ; Kim, D. W. ; Leem, Y. A. ; Oh, J. C. ; Park, G. H. ; Woo, J. C. ; Yoo, K. H.
[S.l.] : American Institute of Physics (AIP)
Published 1993
[S.l.] : American Institute of Physics (AIP)
Published 1993
| ISSN: |
1089-7550
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|---|---|
| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
Photoluminescence (PL) and PL excitation (PLE) experiments on a GaAs/Al0.25Ga0.75As asymmetric coupled double quantum well are reported. In PLE, the seven peaks, four related to the heavy-hole coupled and the rest to the light-hole coupled excitonic states, are observed. The positions of seven peaks observed in PLE are in good agreement with the calculated results of multi-band envelope function approximation using the transfer matrix method. The result of the temperature-dependent PL above 100 K shows that, even though the wavefunctions are localized in different wells separated by 8 monolayer barrier, the heavy-hole coupled excitons in the two lowest levels are in thermal equilibrium. The observed activation energy is equal to the difference between the two levels.
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| Type of Medium: |
Electronic Resource
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| URL: |