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Design and modelling of PbTe wide quantum wells based on the n–i–p–i concept

✍ Scribed by G. Span; P. Ganitzer; G. Heigl; A. Homer; J. Oswald

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
290 KB
Volume
23
Category
Article
ISSN
0749-6036

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✦ Synopsis

Wide quantum wells (WQW) are of special interest because of their intermediate regime between 2D and 3D behaviour. According to the n-i-p-i concept, the design is based on a p-n-p structure with non-depleted n-and p-layers which form a wide quantum well (channel width 100-1000 nm). We present self-consistent model calculations for wide and multiple PbTe quantum wells in a perpendicular magnetic field. The calculations take into account the feedback of the carrier redistribution between the subband-Landau levels on the confining potential with some unusual consequences. Instead of an oscillating Fermi energy the width of the n-channel varies as a function of the magnetic field. A WQW does not allow the occurrence of integer filling factor one at high magnetic fields. In a non-periodic multiple quantum well the different potential minima are forced to match one another.

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