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Anisotropic Fermi Contour of (001) GaAs Holes in Parallel Magnetic Fields

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arxiv 1210.1672 v1 pith:NW4X4ZEF submitted 2012-10-05 cond-mat.mes-hall

Anisotropic Fermi Contour of (001) GaAs Holes in Parallel Magnetic Fields

D. Kamburov , M. Shayegan , R. Winkler , L. N. Pfeiffer , K. W. West , K. W. Baldwin This is my paper
classification cond-mat.mes-hall
keywords fermianisotropycontourgaasmagneticoscillationsparallelagreement
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We report a severe, spin-dependent, Fermi contour anisotropy induced by parallel magnetic field in a high-mobility (001) GaAs two-dimensional hole system. Employing commensurability oscillations created by a unidirectional, surface-strain-induced, periodic potential modulation, we directly probe the anisotropy of the two spin subband Fermi contours. Their areas are obtained from the Fourier transform of the Shubnikov-de Haas oscillations. Our findings are in semi-quantitative agreement with the results of parameter-free calculations of the energy bands.

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