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Nuclear electric resonance (NER) is based on nuclear magnetic resonancemediated by spatial oscillations of electron spin domains excited by a radiofrequency (RF) electric field, and it allows us to investigate the spatialdistribution of the nuclear spin polarization around domain walls (DWs). Here,NER measurements were made of the dynamic nuclear spin polarization (DNP) atthe spin phase transition of the fractional quantum Hall state at a Landaulevel filling factor of $\nu=2/3$. From the RF pulse power and pulse durationdependence of the NER spectrum, we show that the DNP occurs only within $\sim100$ nm around DWs, and that it does not occur in DWs. We also show that DWsare pinned by the hyperfine field from polarized nuclear spins.

Spatial distribution of dynamically polarized nuclear spins in electron  spin domains in the $\nu = 2/3$ fractional quantum Hall state studied by  nuclear electric resonance