title: Role of density imbalance in an interacting bilayer hole system.
abstract: 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 nu=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.
authors.affiliation: Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: E
authors.initials: E
authors.lastname: Tutuc
authors.forename: S
authors.initials: S
authors.lastname: Melinte
authors.forename: E P
authors.initials: EP
authors.lastname: De Poortere
authors.forename: R
authors.initials: R
authors.lastname: Pillarisetty
authors.forename: M
authors.initials: M
authors.lastname: Shayegan