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Greilich, Philip E.; Greilich, Nancy B.; Froelich, Edward G.

doi:10.1097/00000542-199608000-00048

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2020

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“…Dynamic nuclear polarization due to spins excited by a periodic train of pulses and rotated by the optical Stark effect has been previously observed and characterized in ZnSe [11]. In those studies, the nuclear systems T 1 time was orders of magnitude shorter than the lab time of their measurements [30,31]. Hence, their nuclear system quickly reached steady state during their experiments and no field sweep direction dependence was observed.…”

Section: Discussionmentioning

confidence: 93%

Dynamic Nuclear Polarization by optical Stark effect in periodically-pumped gallium arsenide

Dominguez,

Iafrate,

Sih

2020

Preprint

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Optical pump-probe time-and magnetic-field-resolved Kerr rotation measurements provide a window into the mechanisms that generate dynamic nuclear polarization in bulk gallium arsenide. Previously, we have reported an unexpected dependence of the direction of the nuclear polarization on the sweep direction of the applied external magnetic field. In this paper, we present numerical calculations based on a model for this nuclear polarization due to the optical orientation and optical Stark effect produced by a train of ultrafast optical pulses. We demonstrate the correspondence of the model to our experimental measurements for different laser wavelengths and magnetic field sweep rates. Finally, we show that the model reproduces the sweep direction dependence and provides an explanation for this behavior.

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Section: Discussionmentioning

confidence: 93%