Transport properties of ν=1 quantum Hall bilayers. Phenomenological description

Abstract

We propose a phenomenological model that describes counterflow and drag experiments with quantum Hall bilayers in a ν_T=1 state. We consider the system consisting of statistically distributed areas with local total filling factors ν_{T1}>1 and ν_{T2}<1. The excess or deficit of electrons in a given area results in an appearance of vortex excitations. The vortices in quantum Hall bilayers are charged. They are responsible for a decay of the exciton supercurrent, and, at the same time, contribute to the conductivity directly. The experimental temperature dependence of the counterflow and drive resistivities is described under accounting viscous forces applied to vortices that are the exponentially increase functions of the inverse temperature. The presence of defect areas where the interlayer phase coherence is destroyed completely can result in an essential negative longitudinal drag resistivity as well as in a counterflow Hall resistivity.

References in corpus (6)

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• Vortex states of a disordered quantum Hall bilayer
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Cited by in corpus (4)

• Graphene Bilayer Structures with Superfluid Magnetoexcitons
• Stationary waves in a superfluid exciton gas in quantum Hall bilayers
• Locking and unlocking of the counterflow transport in nu=1 quantum Hall bilayers by tilting of magnetic field
• Electron-hole pairing in topological insulator heterostructures in the quantum Hall state