Electrical Control of Two-Dimensional Electron-Hole Fluids in the Quantum Hall Regime

Abstract

We study the influence of quantizing perpendicular magnetic fields on the ground state of a bilayer with electron and hole fluids separated by an opaque tunnel barrier. In the absence of a field, the ground state at low carrier densities is a condensate of s-wave excitons that has spontaneous interlayer phase coherence. We find that a series of phase transitions emerge at strong perpendicular fields between condensed states and incompressible incoherent states with full electron and hole Landau levels. When the electron and hole densities are unequal, condensation can occur in higher angular momentum electron-hole pair states and, at weak fields, break rotational symmetry. We explain how this physics is expressed in dual-gate phase diagrams, and predict transport and capacitively-probed thermodynamic signatures that distinguish different states.

References in corpus (8)

• Exciton-polariton condensates
• Evidence of high-temperature exciton condensation in 2D atomic double layers
• High-temperature superfluidity with indirect excitons in van der Waals heterostructures
• Models of coherent exciton condensation
• Exciton condensate at a total filling factor of 1 in Corbino 2D electron bilayers
• Electrically Controlled Two-Dimensional Electron-Hole Fluids
• Microscopic Theory of Equilibrium Polariton Condensates
• Structure of exciton condensates in imbalanced electron-hole bilayers

Cited by in corpus (1)

• Longitudinal Josephson effect in systems with pairing of spatially separated electrons and holes