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We report on transport signatures of hidden quantum Hall stripe (hQHS) phasesin high ($N > 2$) half-filled Landau levels ofAl$_{x}$Ga$_{1-x}$As/Al$_{0.24}$Ga$_{0.76}$As quantum wells with varying Almole fraction $x < 10^{-3}$. Residing between the conventional stripe phases(lower $N$) and the isotropic liquid phases (higher $N$), where resistivitydecreases as $1/N$, these hQHS phases exhibit isotropic and $N$-independentresistivity. Using the experimental phase diagram we establish that the stripephases are more robust than theoretically predicted, calling for improvedtheoretical treatment. We also show that, unlike conventional stripe phases,the hQHS phases do not occur in ultrahigh mobility GaAs quantum wells, but arelikely to be found in other systems.

Hidden Quantum Hall Stripes in Al$_{x}$Ga$_{1-x}$As/Al$_{0.24}$Ga$_{0.76}$As Quantum Wells