Via measurements of commensurability features near Landau filling factor ν=1/2, we probe the shape of the Fermi contour for hole-flux composite fermions confined to a wide GaAs quantum well. The data reveal that the composite fermions are strongly influenced by the characteristics of the Landau level in which they are formed. In particular, their Fermi contour is warped when their Landau level originates from a hole band with significant warping.
@article{arxiv.1412.1447,
title = {Composite Fermions with a Warped Fermi Contour},
author = {M. A. Mueed and D. Kamburov and Yang Liu and M. Shayegan and L. N. Pfeiffer and K. W. West and K. W. Baldwin and R. Winkler},
journal= {arXiv preprint arXiv:1412.1447},
year = {2015}
}