Interaction effects and the metallic phase in p-SiGe

Details Interaction effects and the metallic phase in p-SiGe Interaction effects and the metallic phase in p-SiGe

2000-11-03

arxiv.org/abs/cond-mat/0011067v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 9 figures. This supercedes, with significant additions, cond-mat/9912041

Scientific paper

Magnetoresistance results are presented for p-SiGe samples on the metallic side of the B=0 metal-insulator transition. The results cannot be understood within the framework of standard theories for quantum corrections of a weakly interacting 2- dimensional system. In particular no logarithmic dependence on temperature is observed, at low fields, in either the longitudinal or Hall resistivities despite evidence in the magnetoresistance of weak localisation effects. Further, the Hall coefficient shows a strong logarithmic dependence on field. The results are better explain by renormalisation group theories and by an anomalous Hall effect associated with strong spin-orbit coupling in the presence of a background spin texture.

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