The low-temperature magnetoresistance of parabolic quantum wells displays pronounced minima between integer filling factors. Concomitantly the Hall effect exhibits overshoots and plateau-like features next to well-defined ordinary quantum Hall plateaus. These effects set in with the occupation of the second subband. We discuss our observations in the context of single-particle Landau fan charts of a two-subband system empirically extended by a density dependent subband separation and an enhanced spin-splitting g*.
@article{arxiv.cond-mat/0602271,
title = {Two-subband quantum Hall effect in parabolic quantum wells},
author = {C. Ellenberger and B. Simovic and R. Leturcq and T. Ihn and S. E. Ulloa and K. Ensslin and D. C. Driscoll and A. C. Gossard},
journal= {arXiv preprint arXiv:cond-mat/0602271},
year = {2009}
}