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High mobility one- and two-dimensional electron systems in nanowire-based quantum heterostructures

By S Funk, M Royo, I Ilaria Zardo, D Rudolph, S Morkötter, B Mayer, Jurgen Becker, A Bechtold, S Matich, M Döblinger, Martin Bichler, G Koblmüller, JJ Finley, A Bertoni, G Goldoni and G Abstreiter

Abstract

Free-standing semiconductor nanowires in combination with advanced gate-architectures hold an exceptional promise as miniaturized building blocks in future integrated circuits. However, semiconductor nanowires are often corrupted by an increased number of close-by surface states, which are detrimental with respect to their optical and electronic properties. This conceptual challenge hampers their potentials in high-speed electronics and therefore new concepts are needed in order to enhance carrier mobilities. We have introduced a novel type of core-shell nanowire heterostructures that incorporate modulation or remote doping and hence may lead to high-mobility electrons. We demonstrate the validity of such concepts using inelastic light scattering to study single modulation-doped GaAs/Al0.16Ga0.84As core-multishell nanowires grown on silicon. We conclude from a detailed experimental study and theoretical analysis of the observed spin and charge density fluctuations that one- and two-dimensional electron channels are formed in a GaAs coaxial quantum well spatially separated from the donor ions. A total carrier density of about 3 x 10(7) cm(-1) and an electron mobility in the order of 50 000 cm(2)/(V s) are estimated. Spatial mappings of individual GaAs/Al0.16Ga0.84As core-multishell nanowires show inhomogeneous properties along the wires probably related to structural defects. The first demonstration of such unambiguous 1D- and 2D-electron channels and the respective charge carrier properties in these advanced nanowire-based quantum heterostructures is the basis for various novel nanoelectronic and photonic devices

Publisher: 'American Chemical Society (ACS)'
Year: 2013
DOI identifier: 10.1021/nl403561w
OAI identifier: oai:library.tue.nl:777582
Provided by: Repository TU/e
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