Resistance peak shift and deviated Hall plateau driven by dynamic nuclear polarization in fractional quantum Hall states

The longitudinal resistance R_xx around the Landau level filling factor ν = 2/3 quantum Hall state (QHS) is transformed to the huge longitudinal resistance state (HLRS) by a dynamic nuclear spin polarization using a large ac excitation current. By measuring the R_xx and Hall resistance R_xy with varying excitation and measurement currents, we find that the HLRS R_xx shows three insulating resistance peaks corresponding to ν = 2/3 spin-unpolarized and spin-polarized QHSs and ν = 3/5 QHS. The peaks at the phase transition points shift to lower or higher ν values depending on the excitation points. Furthermore, we observe a deviation of R_xy from the quantized value that depends on the filling factor of the excitation point. We discuss a possible mechanism for the insulating behavior of HLRS R_xx and deviated R_xy around the ν = 2/3 QHS using the recently discovered stripe domain structure, and explain the peak shifts in terms of the Overhauser field constructed in the stripe domains. (author)