Anisotropic Fermi Contour of Composite Fermions in Tilted Magnetic Fields

ORAL

Abstract

We employ surface-strain-induced commensurability oscillations of hole-flux composite fermions to study the effect of parallel magnetic field on their Fermi contours in high-quality C-doped (001) GaAs hole quantum wells. Our measurements reveal that the composite fermion Fermi contours are significantly distorted in the presence of parallel field. Along the direction of the parallel field, the Fermi wave vectors shrink while in the perpendicular direction they grow, and at 25 T parallel field, the relative distortion reaches 50{\%}.

*We acknowledge support through the NSF (ECCS-1001719 and MRSEC DMR-0819860) for sample fabrication and characterization, and the DOE BES (DE-FG0200-ER45841) for measurements.

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Authors

  • Mansour Shayegan

    • Princeton University

  • Dobromir Kamburov

    • Princeton University

  • Yang Liu

    • Princeton University

  • M.A. Mueed

    • Princeton University

  • Sukret Hasdemir

    • Princeton University

  • Loren Pfeiffer

    • Princeton University

  • Kenneth West

    • Princeton University

  • Kirk Baldwin

    • Princeton University