Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime

作者：Kou A^*; McClure D T; Marcus C M; Pfeiffer L N; West K W

来源：Physical Review Letters, 2010, 105(5): 056804.

DOI：10.1103/PhysRevLett.105.056804

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, v = 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.

• 出版日期2010-7-30