Searches for Skyrmions in the Limit of Zero g-Factor

Details Searches for Skyrmions in the Limit of Zero g-Factor Searches for Skyrmions in the Limit of Zero g-Factor

1998-05-27

arxiv.org/abs/cond-mat/9805357v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 9 figures. To appear in Semiconductor Science and Technology

Scientific paper

10.1088/0268-1242/13/7/004

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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