Optically pumped NMR evidence for finite-size Skyrmions in GaAs quantum wells near Landau level filling ν=1

Abstract

The Knight shift [Ks(ν,T)] and spin-lattice relaxation time [T1(ν,T)] of the 71Ga nuclei located in n-doped GaAs quantum wells are measured using optically pumped NMR, for Landau level filling 0.66 <1, the data are consistent with a many-body ground state which is not fully spin polarized, with a very small spin excitation gap that increases as ν→23. © 1995 The American Physical Society.