The dynamical frustration of interlayer excitons delocalizing in bilayer quantum antiferromagnets

Abstract

Using the self-consistent Born approximation we study the delocalization of interlayer excitons in the bilayer Heisenberg quantum antiferromagnet. Under realistic conditions we find that the coupling between the exciton motion and the spin system is strongly enhanced as compared to the case of a single carrier, to a degree that it mimics the confinement physics of carriers in Ising spin systems. We predict that the "ladder spectrum" associated with this confinement physics should be visible in the c-axis exciton spectra of insulating bilayer cuprates such as YBa2Cu3O6. Our discovery indicates that finite density systems of such excitons should show very rich physical behavior.

6 pages, 6 figures. Updated version that has been submitted to Europhysics Letters

References in corpus (3)

• Anomalous Fermi-Surface Dependent Pairing in a Self-Doped High-Tc Superconductor
• Electron-Hole Liquids in Transition Metal Oxide Heterostructures
• The Electronic States of Two Oppositely doped Mott Insulators Bilayers

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• Determinant quantum Monte Carlo study of exciton condensation in the bilayer Hubbard model
• Exciton condensation in strongly correlated electron bilayers
• Dynamics of doublon-holon pairs in Hubbard two-leg ladders
• Enhancement of spin propagation due to interlayer exciton condensation
• Dynamics of a single exciton in strongly correlated bilayers
• The origin of exciton mass in a frustrated Mott insulator Na${}_2$IrO${}_3$
• Excitonic gap formation in neutral bilayer structures
• Density of states and excitonic condensation in the double layer correlated systems
• Magnetic polarons due to spin-length fluctuations in ${\mathbf{d}}^4$ spin-orbit Mott systems