Anisotropic Fermi contour of (001) GaAs electrons in parallel magnetic fields

Article

关键词: MAGNETORESISTANCE OSCILLATIONS;    QUANTUM-WELLS;    GAS;    SUPERLATTICES;   

DOI  :  10.1103/PhysRevB.88.125435

来源: SCIE

【 摘 要 】

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 semiquantitatively with the results of parameter-free calculations of the Fermi contours, but there are significant discrepancies.

【 授权许可】

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