Weak localisation, hole-hole interactions and the "metal"-insulator transition in two dimensions

Details Weak localisation, hole-hole interactions and the "metal"-insulator transition in two dimensions Weak localisation, hole-hole interactions and the "metal"-insulator transition in two dimensions

1999-10-22

arxiv.org/abs/cond-mat/9910368v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.84.2489

A detailed investigation of the metallic behaviour in high quality GaAs-AlGaAs two dimensional hole systems reveals the presence of quantum corrections to the resistivity at low temperatures. Despite the low density ($r_{s}>10$) and high quality of these systems, both weak localisation (observed via negative magnetoresistance) and weak hole-hole interactions (giving a correction to the Hall constant) are present in the so-called metallic phase where the resistivity decreases with decreasing temperature. The results suggest that even at high $r_{s}$ there is no metallic phase at T=0 in two dimensions.

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