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

N. N. Kuzma; P. Khandelwal; S. E. Barrett; L. N. Pfeiffer; K. W. West

doi:10.1126/science.281.5377.686

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

Mesoscale and Nanoscale Physics 2009-10-31 v2

Authors: N. N. Kuzma , P. Khandelwal , S. E. Barrett , L. N. Pfeiffer , K. W. West

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

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.

Keywords

optically pumped NMR electron spin dynamics GaAs quantum well fractional quantum Hall effect spin relaxation localization

Cite

@article{arxiv.cond-mat/9907279,
  title  = {Ultraslow Electron Spin Dynamics in GaAs Quantum Wells Probed by Optically Pumped NMR},
  author = {N. N. Kuzma and P. Khandelwal and S. E. Barrett and L. N. Pfeiffer and K. W. West},
  journal= {arXiv preprint arXiv:cond-mat/9907279},
  year   = {2009}
}

Comments

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

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

Abstract

Keywords

Cite

Comments

Related papers