Magnetotransport and Magnetooptics of InAs1-xSbx and Heterojunctions Combinations Formed Between InAs and GaSb, AlSb Or InAs1 -xSbx |
| R.A. Stradling Blackett Laboratory, Imperial College of Science, Technology & Medicine, London SW7 2BZ, UK |
| Full Text PDF |
| Cyclotron resonance and interband measurements are reported in magnetic fields up to 160 T for InAs/InAs1-xSbx superlattices, one of which is a "self-organised" or "natural" superlattice, and InAs1-xSbx epilayers. The samples were grown by MBE at temperatures between 370°C to 500°C. No dependence of the band gap, effective masses or g-values on the growth temperature was detected. Anomalous tilt behaviour was observed for the superlattices. Inversion asymmetry induced spin-splitting of the subbands in gated InAs quantum wells is investigated by means of the Shubnikov-de Haas effect and cyclotron resonance. The non-parabolicity was well fitted by Kane theory, although the measured values of effective mass were substantially higher than predictions. Infrared life time measurements at wavelengths between 6 and 85 microns are undertaken with free electron lasers on InAs/InAs1-xSbx superlattices and InAs/AlSb quantum wells. Suppression of the Auger recombination times is demonstrated with the superlattices. |
| DOI: 10.12693/APhysPolA.92.851 PACS numbers: 72.20.My, 76.40.+b, 78.20.Ls |