Composite Fermions with Tunable Fermi Contour Anisotropy

D. Kamburov, Yang Liu, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin

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Abstract

The composite fermion formalism elegantly describes some of the most fascinating behaviors of interacting two-dimensional carriers at low temperatures and in strong perpendicular magnetic fields. In this framework, carriers minimize their energy by attaching two flux quanta and forming new quasiparticles, the so-called composite fermions. Thanks to the flux attachment, when a Landau level is half-filled, the composite fermions feel a vanishing effective magnetic field and possess a Fermi surface with a well-defined Fermi contour. Our measurements in a high-quality two-dimensional hole system confined to a GaAs quantum well demonstrate that a parallel magnetic field can significantly distort the hole-flux composite fermion Fermi contour.

Original languageEnglish (US)
Article number206801
JournalPhysical review letters
Volume110
Issue number20
DOIs
StatePublished - May 13 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Kamburov, D., Liu, Y., Shayegan, M., Pfeiffer, L. N., West, K. W., & Baldwin, K. W. (2013). Composite Fermions with Tunable Fermi Contour Anisotropy. Physical review letters, 110(20), [206801]. https://doi.org/10.1103/PhysRevLett.110.206801