Scaling of local and nonlocal resistances in a 2D topological insulator based on HgTe quantum well

We report the observation and systematic investigation of a local and nonlocal transport in HgTe quantum wells with inverted band structure corresponding to the two-dimensional topological insulator phase. We examine the probe spacing and probe configuration dependencies of the resistance near the charge neutrality point, where the transport is dominated by edge states. We provide details on the model, which takes into account the edge and bulk contribution to the total current and reproduces our experimental results. (paper)