Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-29
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures, EP2DS 17, to be published in Physica E
Scientific paper
10.1016/j.physe.2007.08.101
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.
Dean Cory R.
Gervais G.
Pfeiffer Loren N.
Piot B. A.
West Ken. W.
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