Phys. Rev. Lett. 91, 076802 (2003) [4 pages]Role of Density Imbalance in an Interacting Bilayer Hole SystemReceived 21 September 2002; published 13 August 2003 We study interacting GaAs hole bilayers in the limit of zero interlayer tunneling. When the layers have equal density, we observe a phase-coherent bilayer quantum Hall state (QHS) at a total filling factor ν=1, flanked by a reentrant insulating phase at nearby fillings which suggests the formation of a pinned, bilayer Wigner crystal. As we transfer charge from one layer to another, the phase-coherent QHS becomes stronger, evincing its robustness against charge imbalance, but the insulating phase disappears, suggesting that its stability requires the commensurability of the two layers. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.076802
DOI:
10.1103/PhysRevLett.91.076802
PACS:
73.50.–h, 71.70.Ej, 73.43.Qt
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