%0 Journal Article
%T Anisotropic Fermi Contour of (001) GaAs Electrons in Parallel Magnetic Fields
%A D. Kamburov
%A M. A. Mueed
%A M. Shayegan
%A L. N. Pfeiffer
%A K. W. West
%A K. W. Baldwin
%A J. J. D. Lee
%A R. Winkler
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.88.125435
%X 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.
%U http://arxiv.org/abs/1306.3537v2