Observation of magnetic field sweep direction dependent dynamic nuclear polarization under periodic optical electron spin pumping

  title={Observation of magnetic field sweep direction dependent dynamic nuclear polarization under periodic optical electron spin pumping},
  author={Michael MacMahon and Joseph R. Iafrate and Michael J. Dominguez and Vanessa Sih},
  journal={Physical Review B},
Optical pump-probe techniques are used to generate and measure electron spin polarization in a gallium arsenide epilayer in which the electron spin coherence time exceeds the mode-locked laser repetition period. Resonant spin amplification occurs at magnetic fields at which the electron spin polarization excited by successive laser pulses adds constructively. Measurements of Kerr rotation as a function of applied magnetic field and pump-probe time delay reveal nuclear spin polarization that… Expand

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