# Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime

 Title: Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime Author: Kou, Angela; McClure, Douglas Templeton; Marcus, Charles Masamed; Pfeiffer, Loren N.; West, Kenneth W. Note: Order does not necessarily reflect citation order of authors. Citation: Kou, Angela, Douglas T. McClure, Charles M. Marcus, Loren N. Pfeiffer and Kenneth W. West. 2010. Dynamic nuclear polarization in the fractional quantum hall regime. Physical Review Letters 105(5): 056804. Full Text & Related Files: Kou_DynamicNuclear.pdf (1.708Mb; PDF) 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, $$\nu = 1/2$$, 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. Published Version: doi:10.1103/PhysRevLett.105.056804 Other Sources: http://marcus.physics.harvard.edu/papers/Kou_DNP_PRL2010.pdf http://arxiv.org/abs/1004.4435 Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:5130441

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