Anomalous magnetotransport in wide quantum wells

Details Anomalous magnetotransport in wide quantum wells Anomalous magnetotransport in wide quantum wells

1997-07-17

arxiv.org/abs/cond-mat/9707173v1

Solid State Commun. 102, 391 (1997)

Physics

Condensed Matter

Materials Science

postscript file including 3 figs, 5 pages

Scientific paper

10.1016/S0038-1098(97)00017-3

We present magneto transport experiments of quasi 3D PbTe wide quantum wells. A plateau-like structure in the Hall resistance is observed, which corresponds to the Shubnikov de Haas oscillations in the same manner as known from the quantum Hall effect. The onsets of plateaux in Rxy do not correspond to 2D filling factors but coincide with the occupation of 3D (bulk-) Landau levels. At the same time a non-local signal is observed which corresponds to the structure in Rxx and Rxy and fulfils exactly the Onsager-Casimir relation (Rij,kl(B) = Rkl,ij(-B)). We explain the behaviour in terms of edge channel transport which is controlled by a permanent backscattering across a system of "percolative EC - loops" in the bulk region. Long range potential fluctuations with an amplitude of the order of the subband splitting are explained to play an essential role in this electron system.

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