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  • Title: Dynamic nuclear polarization in the fractional quantum Hall regime.
    Author: Kou A, McClure DT, Marcus CM, Pfeiffer LN, West KW.
    Journal: Phys Rev Lett; 2010 Jul 30; 105(5):056804. PubMed ID: 20867946.
    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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