Dynamic nuclear polarization in the fractional quantum hall regime

A. Kou, D. T. McClure, C. M. Marcus, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number056804
JournalPhysical review letters
Volume105
Issue number5
DOIs
StatePublished - Jul 30 2010
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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