We demonstrate a severe Fermi contour anisotropy induced by the application of a parallel magnetic field to high-mobility electrons confined to a 30-nm-wide (001) GaAs quantum well. We study commensurability oscillations, namely geometrical resonances of the electron orbits with a unidirectional, surface-strain-induced, periodic potential modulation, to directly probe the size of the Fermi contours along and perpendicular to the parallel field. Their areas are obtained from the Shubnikov-de Haas oscillations. Our experimental data agree semi-quantitatively with the results of parameter-free calculations of the Fermi contours but there are significant discrepancies.
@article{arxiv.1306.3537,
title = {Anisotropic Fermi Contour of (001) GaAs Electrons in Parallel Magnetic Fields},
author = {D. Kamburov and M. A. Mueed and M. Shayegan and L. N. Pfeiffer and K. W. West and K. W. Baldwin and J. J. D. Lee and R. Winkler},
journal= {arXiv preprint arXiv:1306.3537},
year = {2015}
}