Barrier layer thickness dependence of electronic sub-band structures in PbTePb1−xSnxTe superlattices
✍ Scribed by S. Shimomura; Y. Urakawa; S. Takaoka; K. Murase; A. Ishida; H. Fujiyasu
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 486 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0749-6036
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✦ Synopsis
Bandedge structures of four kinds of n-PbTe/Pb0.sS.n0.2Te superlattices with different barrier layer (Pb0.8Sn0.2Te layer) thicknesses from 30 A to 220 A have been investigated by using magneto-plasma and Shubnikov-de Haas oscillation measurements. The layer thicknesses of PbTe are about 200/k for these samples. Electrons belonging to the (111) valley directed along the growth direction still remain 2-dimensional even at 30 A barrier layers. For electrons belonging to the other three tilted valleys, 2-dimensional to 3dimensional transitions depending on the barrier layer thickness are demonstrated. Subband structures are also calculated using an envelope function approximation. The results based on a conduction band edge discontinuity of 60 meV reproduce very well measured cyclotron resonance masses.