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A short-period (period a=92 nm) unidirectional lateral superlattice with a uniform back gate has been used to investigate detailed dependence of anisotropic transport in N>=2 Landau levels on electron density n_e. Within rather narrow n_e range of 1.85-2.07×10^15 m^-2, resistance peaks of quantum Hall transition regions are observed to grow (diminish) rapidly with ne for the current across (along) the superlattice. The peak between filling factors 4 and 5 starts to split above about 2.0×10^15 m^-2 for the current across the superlattice, with the valley in between showing thermally activated temperature dependence with gap energy about 140 mK. The observed behavior of anisotropic transport suggests the relevance of the theoretically predicted charge density wave state.

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