Optically Pumped NMR Evidence for Finite-Size Skyrmions in GaAs Quantum Wells near Landau Level Filling ν=1

S. E. Barrett, G. Dabbagh, L. N. Pfeiffer, K. W. West, and R. Tycko
Phys. Rev. Lett. 74, 5112 – Published 19 June 1995
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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<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 ν23.

  • Received 19 December 1994

DOI:https://doi.org/10.1103/PhysRevLett.74.5112

©1995 American Physical Society

Authors & Affiliations

S. E. Barrett, G. Dabbagh, L. N. Pfeiffer, K. W. West, and R. Tycko

  • AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974

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Vol. 74, Iss. 25 — 19 June 1995

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