Investigation of band non-parabolicities in strain-balanced GaInAs/GaAlInAs coupled quantum wells

✍ Scribed by R.W. Martin; F.J. McGow; M. Hopkinson; J.P.R. David

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 84 KB
• Volume: 22
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0304

✦ Synopsis

Magneto-optical investigations of a series of strain-balanced InGaAs/GaAlInAs coupled quantum wells are described, showing how changes in the strain within the InGaAs wells modify the conduction and valence-band dispersion curves. Large non-parabolicities in both bands are demonstrated by comparison of measured and calculated excitonic Landau levels. Increasing tensile strain within the wells results in the heavy-hole in-plane mass changing from a very high value to less than 0.2 m 0 as the first light-hole confined level shifts to an energy above that of the first heavy-hole state.