Abstract
A nuclear magnetic resonance (NMR) study is reported of multiple (30) ${\mathrm{Al}}_{0.13}{\mathrm{Ga}}_{0.87}\mathrm{As}$ quantum well (QW) sample near the Landau level filling factor $\ensuremath{\nu}=1$. In these ${\mathrm{Al}}_{0.13}{\mathrm{Ga}}_{0.87}\mathrm{As}$ QWs the effective $g$ factor is nearly zero. This can lead to two effects: vanishing electronic polarization $(\mathcal{P})$ and skyrmionic excitations composed of a huge number of spins. As small $\mathcal{P}$ 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 ${T}_{2}^{\ensuremath{-}1}$ rate.
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