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

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

1999-07-19

arxiv.org/abs/cond-mat/9907279v2

Science vol. 281, 686 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages (REVTEX), 6 eps figures embedded in text; published version; minor changes to match published version

Scientific paper

10.1126/science.281.5377.686

Optically pumped nuclear magnetic resonance (OPNMR) measurements were performed in two different electron-doped multiple quantum well samples near the fractional quantum Hall effect ground state nu=1/3. Below 0.5K, the spectra provide evidence that spin-reversed charged excitations of the nu=1/3 ground state are localized over the NMR time scale of ~40 microseconds. Furthermore, by varying NMR pulse parameters, the electron spin temperature (as measured by the Knight shift) could be driven above the lattice temperature, which shows that the value of the electron spin-lattice relaxation time lies between 100 microseconds and 500 milliseconds at nu=1/3.

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