Anisotropic composite fermions and fractional quantum Hall effect

M. A. Mueed, D. Kamburov, S. Hasdemir, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan
Phys. Rev. B 93, 195436 – Published 26 May 2016

Abstract

We study the role of anisotropy on the transport properties of composite fermions near Landau level filling factor ν=1/2 in two-dimensional holes confined to a GaAs quantum well. By applying a parallel magnetic field, we tune the composite fermion Fermi sea anisotropy and monitor the relative change of the transport scattering time at ν=1/2 along the principal directions. Interpreted in a simple Drude model, our results suggest that the scattering time is longer along the longitudinal direction of the composite fermion Fermi sea. Furthermore, the measured energy gap for the fractional quantum Hall state at ν=2/3 decreases when anisotropy becomes significant. The decrease, however, might partly stem from the charge distribution becoming bilayerlike at very large parallel magnetic fields.

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  • Received 23 December 2015
  • Revised 8 April 2016

DOI:https://doi.org/10.1103/PhysRevB.93.195436

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. A. Mueed, D. Kamburov, S. Hasdemir, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan

  • Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Issue

Vol. 93, Iss. 19 — 15 May 2016

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