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

V. F. Mitrović, M. Horvatić, C. Berthier, S. A. Lyon, M. Shayegan

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Abstract

A nuclear magnetic resonance (NMR) study is reported of multiple (30) Al0.13 Ga0.87 As quantum well (QW) sample near the Landau level filling factor ν=1. In these Al0.13 Ga0.87 As 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 T2 -1 rate.

Original languageEnglish (US)
Article number115335
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number11
DOIs
StatePublished - Sep 27 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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