Phys. Rev. Lett. 74, 5112–5115 (1995)Optically Pumped NMR Evidence for Finite-Size Skyrmions in GaAs Quantum Wells near Landau Level Filling ν = 1Received 19 December 1994; published in the issue dated 19 June 1995 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<ν<1.76 and temperature 1.55<T<20 K. Ks(ν) [proportional to the electron spin polarization 〈Sz(ν)〉] drops precipitously on either side of ν = 1, which is evidence that the charged excitations of the ν = 1 ground state are finite-size Skyrmions. For ν<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→2/3. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.5112
DOI:
10.1103/PhysRevLett.74.5112
PACS:
73.20.Dx, 73.20.Mf, 73.40.Hm, 76.60.-k
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