Resistively-Detected NMR in a Two-Dimensional Electron System near $ν = 1$: Clues to the Origin of the Dispersive Lineshape

Details Resistively-Detected NMR in a Two-Dimensional Electron System near $ν = 1$: Clues to the Origin of the Dispersive Lineshape Resistively-Detected NMR in a Two-Dimensional Electron System near $ν = 1$: Clues to the Origin of the Dispersive Lineshape

2005-11-14

arxiv.org/abs/cond-mat/0511321v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures. Version accepted for publication in Phys. Rev.B, Rapid Communications

Scientific paper

10.1103/PhysRevB.73.121306

Resistively-detected NMR measurements on 2D electron systems near the $\nu = 1$ quantum Hall state are reported. In contrast to recent results of Gervais \emph{et al.} [Phys. Rev. Lett. $\bf 94$, 196803 (2005)], a dispersive lineshape is found at all RF powers studied and Korringa-like nuclear spin-lattice relaxation is observed. The shape of the unexplained dispersive lineshape is found to invert when the temperature derivative of the longitudinal resistance changes sign. This suggests that both Zeeman and thermal effects are important to resistively-detected NMR in this regime.

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