Two- and three-electron bubbles in AlxGa1-xAs / Al0.24Ga0.76As quantum wells
X. Fu (University of Minnesota)
Q. Shi (University of Minnesota, Columbia University)
M. A. Zudov (University of Minnesota)
G. C. Gardner (Purdue University)
J. D. Watson (TU Delft - BUS/Quantum Delft, Purdue University)
Michael J. Manfra (Purdue University)
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Abstract
We report on transport signatures of eight distinct bubble phases in the N=3 Landau level of an AlxGa1-xAs/Al0.24Ga0.76As 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 states in low-temperature transport measurements.
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