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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

Version of Record online: 17 DEC 2012 | DOI: 10.1002/pssb.201248431

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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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