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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2005, Volume 82, Issue 10, Pages 734–740
(Mi jetpl1624)
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This article is cited in 3 scientific papers (total in 3 papers)
CONDENSED MATTER
Thermally activated negative photoconductivity below 6 K in p-GaAs/Al0.5Ga0.5As heterostructures and the effect of uniaxial compression
N. Ya. Mininaa, A. A. Il'evskiia, W. Kraakb a M. V. Lomonosov Moscow State University, Faculty of Physics
b Humboldt-Universität zu Berlin, Institut für Physik, Berlin
Abstract:
Thermally activated negative photoconductivity is observed in p-GaAs/Al0.5Ga0.5As:Be heterostructures under illumination with red light at temperatures below 6 K. As the temperature decreases, the concentration and mobility of 2D holes in the quantum well drop sharply, particularly under uniaxial compression. The phenomenon is quantitatively described under the assumption that a layer of deep donor-like traps with a low thermal activation barrier E B = 3.0 ± 0.5 meV exists at a distance of about 7 nm from the heterojunction and that this barrier does not change with strain. Presumably, the traps may be the p-type dopant Be atoms diffusing from the active layer and occupying interstitial positions.
Received: 26.09.2005 Revised: 11.10.2005
Citation:
N. Ya. Minina, A. A. Il'evskii, W. Kraak, “Thermally activated negative photoconductivity below 6 K in p-GaAs/Al0.5Ga0.5As heterostructures and the effect of uniaxial compression”, Pis'ma v Zh. Èksper. Teoret. Fiz., 82:10 (2005), 734–740; JETP Letters, 82:10 (2005), 652–657
Linking options:
https://www.mathnet.ru/eng/jetpl1624 https://www.mathnet.ru/eng/jetpl/v82/i10/p734
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