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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