title: W line shape in the resistively detected nuclear magnetic resonance.
abstract: The resistively detected nuclear magnetic resonance (RDNMR) performed on a two-dimensional electron gas is known to exhibit a peculiar 'dispersive' line shape at some filling factors, especially around ν = 1. Here, we study in detail the inversion of the dispersive line shape as a function of the filling factor from ν = 1 to 2/3. The RDNMR spectra show a new characteristic W line shape in the longitudinal resistance, whereas dispersive lines detected in the Hall resistance remain unchanged. This W resonance, like the dispersive line, can be fitted correctly by a model of two independent response functions, which are the signatures of polarized and unpolarized electronic sub-systems.
authors.affiliation: Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, Montpellier, France. Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 38042 Grenoble, France.
authors.forename: W
authors.initials: W
authors.lastname: Desrat
authors.forename: B A
authors.initials: BA
authors.lastname: Piot
authors.forename: D K
authors.initials: DK
authors.lastname: Maude
authors.forename: Z R
authors.initials: ZR
authors.lastname: Wasilewski
authors.forename: M
authors.initials: M
authors.lastname: Henini
authors.forename: R
authors.initials: R
authors.lastname: Airey