Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 40, Issue 5, Pages 1389-1391Publisher
ELSEVIER
DOI: 10.1016/j.physe.2007.09.022
Keywords
hyperfine interaction; quantum Hall effect breakdown; nuclear magnetic resonance; Knight shift
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Nuclear spins are polarized electrically in a breakdown regime of an odd-integer quantum Hall effect (QHE). Electron excitation to the upper Landau subband with the opposite spin polarity flips nuclear spins through the hyperfine interaction. The polarized nuclear spins reduce the spin-splitting energy and accelerate the QHE breakdown. The Knight shift of the nuclear spins is also measured by tuning electron density during the irradiation of radio-frequency magnetic fields. (c) 2007 Elsevier B.V. All rights reserved.
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