NMR study of large skyrmions in Al0.13Ga0.87As quantum wells

V. F. Mitrović, M. Horvatić, C. Berthier, S. A. Lyon, and M. Shayegan
Phys. Rev. B 76, 115335 – Published 27 September 2007

Abstract

A nuclear magnetic resonance (NMR) study is reported of multiple (30) Al0.13Ga0.87As quantum well (QW) sample near the Landau level filling factor ν=1. In these Al0.13Ga0.87As QWs the effective g factor is nearly zero. This can lead to two effects: vanishing electronic polarization (P) and skyrmionic excitations composed of a huge number of spins. As small P values cause an overlap of the NMR signals from the QW and barriers, a special technique was employed to allow these two signals to be distinguished. The QW signal corresponds to a small, negative, and very broad distribution of spin polarization that exhibits thermally induced depolarization. Such a distribution can be attributed to sample inhomogeneities and/or to large skyrmions, the latter possibility being favored by observation of a very fast T21 rate.

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  • Received 25 May 2007

DOI:https://doi.org/10.1103/PhysRevB.76.115335

©2007 American Physical Society

Authors & Affiliations

V. F. Mitrović1,2, M. Horvatić1, C. Berthier1, S. A. Lyon3, and M. Shayegan3

  • 1Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS, Boîte Postale 166, 38042 Grenoble Cedex 9, France
  • 2Department of Physics, Brown University, Providence, Rhode Island 02912, USA
  • 3Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Vol. 76, Iss. 11 — 15 September 2007

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