Disorder and localization at the LaAlO3/SrTiO3 heterointerface

Through low-temperature electrical transport and magnetotransport, we investigate the role of disorder on the metallicity at the (001) LaAlO3/SrTiO3 heterointerface. We observe a trend of reduced mobility in higher sheet carrier concentration samples, and therefore speculate that disorder and carriers are introduced concomitantly in purely polar instability-induced metallic interfaces. Magnetotransport distinctly reveals stronger spin-orbit interaction in higher carrier concentration samples. The competition between spin-orbit scattering and inelastic scattering is explored through a temperature dependence study of the magnetotransport.