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28 March 2024
 
  » arxiv » cond-mat/0109469

 Article overview


Two band transport and the question of a metal-insulator transition in GaAs/GaAlAs two dimensional holes
Yuval Yaish ; Oleg Prus ; Evgeny Buchstab ; Gidi Ben Yoseph ; Uri Sivan ; Iddo Ussishkin ; Ady Stern ;
Date 25 Sep 2001
Subject Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall
AffiliationTechnion), Iddo Ussishkin, Ady Stern (Weizmann
AbstractThe 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.
Source arXiv, cond-mat/0109469
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