Scaling behavior of metal–insulator transitions in a Si/SiGe two dimensional hole gas

We report the temperature dependence of magnetotransport measurements in a Si/SiGe two-dimensional hole gas (2DHG) and we analyze the curves in terms of scaling. A reentrant insulating transition is observed at filling factor ν=1.5, followed by a second high field insulating phase at ν<1. A scaling behavior in temperature of the width of the longitudinal conductivity, its second derivative and the slope of the Hall conductivity has been observed, for both the transitions to the insulating state.