As quantum wells*

We report on transport signatures of eight distinct bubble phases in the N = 3 Landau level of an Al_xGa_1−xAs/Al_0.24Ga_0.76As quantum well with x = 0.0015. These phases occur near partial filling factors ν� ≈ 0.2 (0.8) and ν� ≈ 0.3 (0.7) and have M = 2 and M = 3 electrons (holes) per bubble, respectively. We speculate that a small amount of alloy disorder in our sample helps to distinguish these broken symmetry state in low-temperature transport measurements.