Spin Excitations of a Two-Dimensional Electron Gas in the Limit of Vanishing Landé g Factor

Electrical transport measurements under hydrostatic pressure have been used to determine the enhanced spin gap at filling factor ν0ex0ex=0ex0ex1 in the limit of vanishing Land\'e g factor (|g|≤0.1). The enhanced spin gap exists even when g0ex0ex=0ex0ex0, and the observed variation of the spin gap around g0ex0ex=0ex0ex0 is qualitatively consistent with recent predictions that the lowest charged excitation has a nontrivial spin order (Skyrmion).