Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-09-25
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
22 pages, with 25 figures
Scientific paper
The magnetotransport of two dimensional holes in a GaAs/AlGaAs heterostructure is studied experimentally and theoretically. Spin-orbit splitting of the heavy hole band is manifested at high carrier densities in two Shubnikov-de Haas frequencies, classical positive magnetoresistance, and weak antilocalization. The latter effect combined with inelastic scattering between the spin-orbit split bands lead to metallic characteristics, namely resistance increase with temperature. At lower densities, when splitting is smaller than the inverse elastic scattering time, the two bands effectively merge to yield the expected insulating characteristics and negative magnetoresistance due to weak localization and interaction corrections to the conductivity. The "metal to insulator" transition at intermediate densities is found to be a smooth crossover between the two regimes rather than a quantum phase transition. Two band calculations of conventional interference and interaction effects account well for the data in the whole parameter range.
Buchstab Evgeny
Prus Oleg
Sivan Uri
Stern Ady
Ussishkin Iddo
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