RAPID COMMUNICATION: Lateral hopping conductivity and large negative magnetoresistance in InAs/AlGaAs self-organized quantum dots

Abstract

We report experimental studies on lateral transport in self-organized quantum dots. We find that below 100 K, conduction occurs through interdot hopping and that experimental results are described quite well by a variable-range hopping model. In the hopping regime, the in-plane conductance varies as G = G0exp [(-T0/T)1/3], and T0 is found to be 7100-9400 K. We have also observed a large negative magnetoresistance in this structure.