Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description ofν<mml:mspace/>=<mml:mspace/>1/2

1999/07/19 by Anatoly Dementyev, A. E. Dementyev, N. N. Kuzma +5
Physics and Astronomy · #Atomic and Subatomic Physics Research #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.83.5074

4 pages (REVTEX), 4 eps figures embedded in text

arxiv created 1999/07/19 · openalex publication_date 1999/12/13 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The Knight shift and the nuclear spin-lattice relaxation rate 1/T₁ of ⁷¹Ga nuclei are measured in GaAs quantum wells at Landau level filling factor \ensuremathν\phantom\rule0ex0ex=\phantom\rule0ex0ex(1)/(2) using optically pumped NMR. The data are compared with predictions of a weakly interacting composite fermion model. Our thermodynamic 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 the \ensuremathν\phantom\rule0ex0ex=\phantom\rule0ex0ex(1)/(2) state.

Citations

• Ultraslow Electron Spin Dynamics in GaAs Quantum Wells Probed by Optically Pumped NMR