Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 40, Issue 5, Pages 990-994Publisher
ELSEVIER
DOI: 10.1016/j.physe.2007.08.101
Keywords
quantum Hall effect; nuclear magnetic resonance; hyperfine interaction; dispersive lineshape
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A study of the resistively detected nuclear magnetic resonance (RDNMR) lineshape in the vicinity of nu = 1 was performed on a high-mobility 2D electron gas formed in GaAs/AlGaAs. In higher Landau levels, application of an RF field at the nuclear magnetic resonance frequency coincides with an observed minimum in the longitudinal resistance, as predicted by the simple hyperfine interaction picture. Near nu = 1 however, an anomalous dispersive lineshape is observed where a resistance peak follows the usual minimum. In an effort to understand the origin of this anomalous peak we have studied the resonance under various RF and sample conditions. Interestingly, we show that the lineshape can be completely inverted by simply applying a DC current. We interpret this as evidence that the minima and maxima in the lineshape originate from two distinct mechanisms. (C) 2007 Elsevier B.V. All rights reserved.
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