Dynamic equation for quantum Hall bilayers with spontaneous interlayer coherence: The low-density limit

Abstract

The bilayer systems exhibit the Bose-Einstein condensation of excitons that emerge due to Coulomb pairing of electrons belonging to one layer with the holes belonging to the other layer. Here we present the microscopic derivation of the dynamic equation for the condensate wave function at a low density of electron-hole ($e-h$) pairs in a strong magnetic field perpendicular to the layers and an electric field directed along the layers. From this equation we obtain the dispersion law for collective excitations of the condensate and calculate the electric charge of the vortex in the exciton condensate. The critical interlayer spacing, the excess of which leads to a collapse of the superfluid state, is estimated. In bilayer systems with curved conducting layers, the effective mass of the $e-h$ pair becomes the function of the $e-h$ pair coordinates, the regions arise, where the energy of the $e-h$ pair is lowered (exciton traps), and lastly $e-h$ pairs can gain the polarization in the basal plane. This polarization leads to the appearance of quantized vortices even at zero temperature.

8 pages

References in corpus (1)

• Vanishing Hall Resistance at High Magnetic Field in a Double Layer Two-Dimensional Electron System

Cited by in corpus (7)

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• Superfluidity of a rarefied gas of electron-hole pairs in a bilayer system
• Transport properties of ν=1 quantum Hall bilayers. Phenomenological description
• Superfluidity of electron-hole pairs in randomly inhomogeneous bilayer systems
• Transition to a supersolid phase in a two-dimensional dilute gas of electron-hole pairs