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Title: Magnetotransport in a pseudomorphic gaas/ga0.8in0.2as/ga0.75al0.25as heterostructure with a si delta-doping layer
Authors: Vanderburgt, M
Karavolas, Vc
Peeters, Fm
Singleton, J
Nicholas, Rj
Herlach, Fritz
Harris, Jj
Vanhove, M
Borghs, Gustaaf #
Issue Date: Oct-1995
Publisher: American physical soc
Series Title: Physical Review B vol:52 issue:16 pages:12218-12231
Abstract: Magnetotransport properties of a pseudomorphic GsAs/Ga0.8In0.2As/Ga0.75Al0.25As heterostructure are investigated in pulsed magnetic fields up to 50 T and at temperatures of T = 1.4 and 4.2 K. The structure studied consists of a Si delta layer parallel to a Ga0.8In0.2As quantum well (QW). The dark electron density of the structure is n(c) = 1.67 x 10(16) m(-2). By illumination the density can be increased up to a factor of 4; this way the second subband in the Ga0.08In0.2As QW can become populated as well as the Si delta layer. The presence of electrons in the delta layer results in drastic changes in the transport data, especially at magnetic fields beyond 30 T. The phenomena observed are interpreted as (i) magnetic freeze-out of carriers in the delta layer when a low density of electrons is present in the delta layer, and (ii) quantization of the electron motion in the two-dimensional electron gases in both the Ga0.8In0.2As QW and the Si delta layer in the case of high densities. These conclusions are corroborated by the numerical results of our theoretical model. We obtain satisfactory agreement between model and experiment.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physics and Astronomy - miscellaneous
# (joint) last author

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