Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description of nu = 1/2

(2) Bell Laboratories; A. E. Dementyev (1); K. W. West (2) ((1) Department of Physics; L. N. Pfeiffer (2); Lucent Technologies); N. N. Kuzma (1); P. Khandelwal (1); S. E. Barrett (1); Yale University

arxiv: cond-mat/9907280 · v1 · submitted 1999-07-19 · ❄️ cond-mat.mes-hall

Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description of nu = 1/2

A. E. Dementyev (1) , N. N. Kuzma (1) , P. Khandelwal (1) , S. E. Barrett (1) , L. N. Pfeiffer (2) , K. W. West (2) ((1) Department of Physics , Yale University , (2) Bell Laboratories

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keywords spincompositeconstraintsdescriptiondynamicselectronfermionoptically

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The Knight shift and the nuclear spin-lattice relaxation rate 1/T1 of Ga-71 nuclei are measured in GaAs quantum wells at Landau level filling factor nu = 1/2 using optically pumped NMR. The temperature dependences of these data are compared with predictions of a weakly-interacting composite fermion model. Our measurements of the electron spin polarization and spin dynamics near the transition between fully and partially spin-polarized ground states provide new constraints on the theoretical description of nu = 1/2.

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Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description of nu = 1/2

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