Two- and three-electron bubbles in AlxGa1−xAs/Al0.24Ga0.76As quantum wells

Two- and three-electron bubbles in AlxGa1−xAs/Al0.24Ga0.76As quantum wells

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 specul...

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Veröffentlicht in:Physical review. B 2019-04, Vol.99 (16), p.1
Hauptverfasser: Fu, X, Shi, Q, Zudov, M A, Gardner, G C, Watson, J D, Manfra, M J
Format: Artikel
Sprache:eng
Schlagworte:
2-dimensional systems
Broken symmetry
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Electron bubbles
Magnetoresistance
MATERIALS SCIENCE
Quantum wells
Resistivity measurements
Transport
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Zusammenfassung: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.99.161402