Quenched and Negative Hall Effect in Periodic Media: Application to Antidot Superlattices

Details Quenched and Negative Hall Effect in Periodic Media: Application to Antidot Superlattices Quenched and Negative Hall Effect in Periodic Media: Application to Antidot Superlattices

1993-12-07

arxiv.org/abs/cond-mat/9312030v1

Physics

Condensed Matter

10 pages, 4 figs on request, RevTeX3.0, Europhysics Letters, in press

Scientific paper

10.1209/0295-5075/25/3/011

We find the counterintuitive result that electrons move in OPPOSITE direction to the free electron E x B - drift when subject to a two-dimensional periodic potential. We show that this phenomenon arises from chaotic channeling trajectories and by a subtle mechanism leads to a NEGATIVE value of the Hall resistivity for small magnetic fields. The effect is present also in experimentally recorded Hall curves in antidot arrays on semiconductor heterojunctions but so far has remained unexplained.

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