Magnetotransport in a pseudomorphic <script type="math/tex">GaAs/Ga_{0.8}In_{0.2}As/Ga_{0.75}Al_{0.25}As</script> heterostructure with a Si <script type="math/tex">\delta</script>-doping layer

van der Burgt, M.; Karavolas, V.C.; Peeters, F.M.; Singleton, J.; Nicholas, R.J.; Herlach, F.; Harris, J.J.; Van Hove, M.; Borghs, G.

doi:10.1103/PHYSREVB.52.12218

Title

Magnetotransport in a pseudomorphic $GaAs/Ga_{0.8}In_{0.2}As/Ga_{0.75}Al_{0.25}As$ heterostructure with a Si $\delta$ -doping layer

Author

van der Burgt, M.

Karavolas, V.C.

Peeters, F.M.

Singleton, J.

Nicholas, R.J.

Herlach, F.

Harris, J.J.

Van Hove, M.

Borghs, G.

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.

Language

English

Source (journal)

Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015

Publication

Lancaster, Pa : 1995

ISSN

1098-0121 [print]

1550-235X [online]

DOI

10.1103/PHYSREVB.52.12218

Volume/pages