Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime
arXiv:1004.4435 · doi:10.1103/PhysRevLett.105.056804
Abstract
We investigate dynamic nuclear polarization in quantum point contacts (QPCs) in the integer and fractional quantum Hall regimes. Following the application of a dc bias, fractional plateaus in the QPC shift symmetrically about half filling of the lowest Landau level, ν=1/2, suggesting an interpretation in terms of composite fermions. Polarizing and detecting at different filling factors indicates that Zeeman energy is reduced by the induced nuclear polarization. Mapping effects from integer to fractional regimes extends the composite fermion picture to include hyperfine coupling.
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- Resistively-detected NMR lineshapes in a quasi-one dimensional electron system
- Non-local polarization feedback in a fractional quantum Hall ferromagnet
- Temperature-dependent dynamical nuclear polarization bistabilities in double quantum dots in the spin-blockade regime
- Localized NMR Mediated by Electrical-Field-Induced Domain Wall Oscillation in Quantum-Hall-Ferromagnet Nanowire
- Dynamic nuclear polarization at high Landau levels in a quantum point contact
- Resistively detected NMR as a probe of the topological nature of conducting edge/surface states
- Spatial gradient of dynamic nuclear spin polarization induced by breakdown of quantum Hall effect