K. A. Kolwas, G. Grabecki, S. Trushkin, J. Wróbel, M. Aleszkiewicz, Ł. Cywiński, T. Dietl, G. Springholz and G. Bauer Absence of nonlocal resistance in microstructures of PbTe quantum wells physica status solidi (b) 250
It is commonly believed that the ocurrence of nonlocal resistances in macroscopic semiconductor structures is an evidence of an edge-channel conduction. For example, this is a case in the quantum Hall effect, where the conductance occurs exclusively via a pair of edge channels. In the present work, Kolwas et al. show experimentally that an apparent nonlocal signal which occurs in epitaxial structures of PbTe is caused by a parallel conducting layer. Suppression of the parallel conduction in improved structures leads to disappearance of the signal, which confirms that PbTe is a trivial, not a topological, insulator. The authors also give an upper bound for the spin-Hall angle for PbTe/PbEuTe microstructures in the diffusive regime.
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