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- Title
OPTICALLY INDUCED DYNAMIC NUCLEAR SPIN POLARIZATION IN QUANTUM HALL REGIME OBSERVED BY A TIME-RESOLVED KERR ROTATION.
- Authors
FUKUOKA, DAISUKE; TANAKA, NAOKI; OTO, KENICHI; MURO, KIYOFUMI; HIRAYAMA, YOSHIRO; KUMADA, NORIO; YAMAGUCHI, HIROSHI
- Abstract
The dynamics between electron and nuclear spins in quantum Hall regime is investigated by a time-resolved Kerr rotation (TRKR) spectroscopy carried down in tilted-field geometry. The spin-flip energy varies almost linearly with the applied magnetic field under the nuclear spin depolarizing radio frequency field and the helicity modulation of circularly polarized pump, while the spin-flip energy obtained under a circularly polarized pump deviates from linearly behavior. This deviation is ascribed to the Overhauser shift due to dynamic nuclear spin polarization (DNP). The DNP depends markedly on the filling factor and present peaks at even filling factors. These results can be well explained by a simple model based on the detailed balance between electron and nuclear spins.
- Subjects
NUCLEAR magnetic resonance; QUANTUM Hall effect; MAGNETIC fields; FREQUENCIES of oscillating systems; POLARIZATION (Nuclear physics)
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2009, Vol 23, Issue 12/13, p2755
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979209062311