Photoluminescence spectroscopy on excitonic states of narrow GaAs–AlGaAs single quantum wells in high magnetic field
✍ Scribed by H.S. Ko; S.J. Rhee; Y.M. Kim; W.S. Kim; D.H. Kim; J.H. Bae; Y.S. Kim; J.C. Woo; D.W. Kim; T. Schmiedel
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 70 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
Magneto-photoluminescence (PL) experiments of very thin GaAs/Al 0.3 Ga 0.7 As quantum wells were performed in a magnetic field (B) of up to 20 T. It has been observed that the diamagnetic shift changes abruptly from β B 2 to α B around 5 T as B increases, and both α and β become larger as the well-width increases. This B-dependent transition is indicative of the change of electron-hole (e-h) coupling as the cyclotron radius becomes comparable with that of the exciton. The change of PL linewidth by B also supports the concept that the e-h recombination is sensitive to the dimensionality.