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Evidence for Skyrmion crystallization from NMR relaxation experiments

G. Gervais·H. L. Stormer·D. C. Tsui·P. L. Kuhns·W. G. Moulton·A. P. Reyes·L. N. Pfeiffer·K. W. Baldwin·K. W. West
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Abstract

A resistively detected NMR technique was used to probe the two-dimensional electron gas in a GaAs/AlGaAs quantum well. The spin-lattice relaxation rate $(1/T_{1})$ was extracted at near complete filling of the first Landau level by electrons. The nuclear spin of $^{75}$As is found to relax much more efficiently with $T\to 0$ and when a well developed quantum Hall state with $R_{xx}\simeq 0$ occurs. The data show a remarkable correlation between the nuclear spin relaxation and localization. This suggests that the magnetic ground state near complete filling of the first Landau level may contain a lattice of topological spin texture, i.e. a Skyrmion crystal.

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G. Gervais, H. L. Stormer, D. C. Tsui, P. L. Kuhns, W. G. Moulton, A. P. Reyes, L. N. Pfeiffer, K. W. Baldwin, K. W. West. 2005-01-01. Evidence for Skyrmion crystallization from NMR relaxation experiments. https://doi.org/10.1103/physrevlett.94.196803

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