Eh. Aifer et al., EVIDENCE OF SKYRMION EXCITATIONS ABOUT NU=1 IN N-MODULATION-DOPED SINGLE QUANTUM-WELLS BY INTERBAND OPTICAL-TRANSMISSION, Physical review letters, 76(4), 1996, pp. 680-683
A dramatic reduction in the spin polarization of a two-dimensional ele
ctron gas in a magnetic field is observed when the Fermi energy moves
off the midpoint of the spin gap of the lowest Landau level, v = 1. Th
e spin polarization is measured by magnetoabsorption spectroscopy whic
h distinguishes the occupancy of the two electron;spin states. The rap
id decay of spin alignment over small changes to both higher and lower
magnetic field provides experimental evidence for the presence of Sky
rmion excitations where exchange energy dominates Zeeman energy in the
quantum Hall regime at v = 1.