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Magnetotransport of electrons in arrays of wires in Si/Si0.7Ge0.3 heterostructures

Authors :
H. Lorenz
Gerhard Abstreiter
P. Baumgartner
D. Többen
M. Holzmann
A Kriele
Friedrich Schäffler
Source :
Surface Science. :673-676
Publication Year :
1996
Publisher :
Elsevier BV, 1996.

Abstract

Magnetotransport parallel to quantum wires in Si/SiGe heterostructures was conducted in the quasi-ballistic regime. We observed magnetoresistance oscillations due to the depopulation of quasi-one dimensional sub-bands, and at low magnetic fields a well pronounced peak arising from diffuse scattering at the wire boundaries emerges. The analysis of these features yields a maximum sub-band spacing of 1 meV at a corresponding wire width of 70 nm. Electron transport perpendicular to shallow etched wires was investigated in lateral superlattices with a period of 350 nm. At magnetic fields below 0.7 T magnetotransport measurements show commensurability oscillations corresponding up to three periods of the wire grating. However, the modulated lateral potential is not purely sinusoidal, resulting in a splitting of the commensurability oscillations.

Details

ISSN :
00396028
Database :
OpenAIRE
Journal :
Surface Science
Accession number :
edsair.doi...........ead5e15350d3c6286ff0d88c9d18e892