Quenching of the Quantum Hall Effect in PbTe Wide Parabolic Quantum Wells

Details Quenching of the Quantum Hall Effect in PbTe Wide Parabolic Quantum Wells Quenching of the Quantum Hall Effect in PbTe Wide Parabolic Quantum Wells

1997-07-17

arxiv.org/abs/cond-mat/9707170v1

Proc. 23rd ICPS Berlin, 2499, World Scientific Singapore 1996

Physics

Condensed Matter

Materials Science

postscript file including 2 figs, 4 pages, Paper presented at ICPS-XXIII, Berlin 1996

Scientific paper

We show that for the case of a many valley host semiconductor an edge channel (EC) related non-local behaviour can persist also in the 3D-regime where the quantum Hall effect (QHE) is already quenched. We demonstrate that the QHE is replaced by conductance fluctuations due to EC backscattering in the contact arms, which leads to a fluctuating current redistribution between a dissipative bulk electron system and a less-dissipative EC-system. Both electron systems are located in different valleys of the band structure. The linear increase of Rxx with the magnetic field is explained by EC-backscattering in the Hall bar

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