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The frequency splitting between the dip and the peak of the resistivelydetected nuclear magnetic resonance (RDNMR) dispersive line shape (DLS) hasbeen measured in the quantum Hall effect regime as a function of fillingfactor, carrier density and nuclear isotope. The splitting increases as thefilling factor tends to {\nu} = 1 and is proportional to the hyperfinecoupling, similar to the usual Knight shift versus {\nu}-dependence. The peakfrequency shifts linearly with magnetic field throughout the studied fillingfactor range and matches the unshifted substrate signal, detected by classicalNMR. Thus, the evolution of the splitting is entirely due to the changingKnight shift of the dip feature. The nuclear spin relaxation time, T1, isextremely long (hours) at precisely the peak frequency. These results areconsistent with the local formation of a {\nu} = 2 phase due to the existenceof spin singlet D$^-$ complexes.

physical review. b, condensed matter and materials physics

Dispersive line shape in the vicinity of the {\nu} = 1 quantum Hall  state: Coexistence of Knight shifted and unshifted resistively detected NMR  responses