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Searches for Skyrmions in the Limit of Zero g-Factor

D. R. Leadley·R. J. Nicholas·D. K. Maude·A. N. Utjuzh·J. C. Portal·J. J. Harris·C. T. Foxon
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Abstract

Energy gaps have been measured for the ferromagnetic quantum Hall effect states at v=1 and 3 in GaAs/GaAlAs heterojunctions as a function of Zeeman energy, which is reduced to zero by applying hydrostatic pressures of up to 20kbar. At large Zeeman energy the gaps are consistent with spin wave excitations. For a low density sample the gap at v=1 decreases with increasing pressure and reaches a minimum when the g-factor vanishes. At small Zeeman energy the excitation appears to consist of a large number of reversed spins and may be interpreted as a Skyrmion. The data also suggest Skyrmionic excitations take place at v=3. The width of the minimum at v=1 is found to decrease as the g-factor is reduced in a similar way for all samples.

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D. R. Leadley, R. J. Nicholas, D. K. Maude, A. N. Utjuzh, J. C. Portal, J. J. Harris, C. T. Foxon. 1998-05-27. Searches for Skyrmions in the Limit of Zero g-Factor. https://doi.org/10.1088/0268-1242%2F13%2F7%2F004

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