Metal-insulator transition in Sb-doped short period [formula omitted] superlattices

Abstract

Low-temperature magnetotransport measurements (50 mK < T < 4.2 K) on Sb-doped short period Si SiGe superlattices ( d ≈ 40 A ̊ ) are presented. The experiments show evidence for single particle quantum interference and enhanced electron-electron interaction effects. Furthermore, for a Sb doping concentration of 4.5 × 10 18 cm −3, a field induced metal to insulator transition (MIT) is observed for magnetic fields B parallel to the superlattice layers, whereas for the perpendicular direction of B, the MIT does not take place. The anisotropy and dimensionality of the SL-samples is discussed.