We investigate the coherent mixing of co-propagating edge channels in a quantum Hall bar produced by step potentials. In the case of two edge channels it is found that, although a single step induces only a few percent mixing, a series of steps could yield 50% mixing. In addition, a strong mixing is found when the potential height of a single step allows a different number of edge channels on the two sides of the step. Charge density probability has been also calculated even for the case where the step is smoothened.
@article{arxiv.1008.1913,
title = {Edge channel mixing induced by potential steps in an integer quantum Hall system},
author = {D. Venturelli and V. Giovannetti and F. Taddei and R. Fazio and D. Feinberg and G. Usaj and C. A. Balseiro},
journal= {arXiv preprint arXiv:1008.1913},
year = {2011}
}