Optically Pumped Nuclear Magnetic Resonance Measurements of the Electron Spin Polarization in GaAs Quantum Wells near Landau Level Filling Factor ν=13

P. Khandelwal, N. N. Kuzma, S. E. Barrett, L. N. Pfeiffer, and K. W. West
Phys. Rev. Lett. 81, 673 – Published 20 July 1998
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Abstract

The Knight shift of the 71Ga nuclei is measured in two different electron-doped multiple quantum well samples using optically pumped NMR. These data are the first direct measurements of the electron spin polarization, P(ν,T)Sz(ν,T)maxSz, near ν=13. The P(T) data at ν=13 probe the neutral spin-flip excitations of a fractional quantum Hall ferromagnet. In addition, the saturated P(ν) drops on either side of ν=13, even in a Btot=12T field. The observed depolarization is quite small, consistent with an average of 0.1 spin flips per quasihole (or quasiparticle), a value which does not appear to be explicable by the current theoretical understanding of the fractional quantum Hall effect near ν=13.

  • Received 20 January 1998

DOI:https://doi.org/10.1103/PhysRevLett.81.673

©1998 American Physical Society

Authors & Affiliations

P. Khandelwal1, N. N. Kuzma1, S. E. Barrett1, L. N. Pfeiffer2, and K. W. West2

  • 1Department of Physics, Yale University, New Haven, Connecticut 06511
  • 2Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974

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Vol. 81, Iss. 3 — 20 July 1998

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