The Electronic States of Two Oppositely doped Mott Insulators Bilayers

Abstract

We study the effect of Coulomb interaction between two oppositely doped low-dimensional tJ model systems. We exactly show that, in the one-dimensional case, an arbitrarily weak interaction leads to the formation of charge neutral electron-hole pairs. We then use two different mean-field theories to address the two-dimensional case, where inter-layer excitons also form and condense. We propose that this results in new features which have no analog in single layers, such as the emergence of an insulating spin liquid phase. Our simple bilayer model might have relevance to the physics of doped Mott insulator interfaces and of the new four layer Ba2CaCu4O8 compound.

arXiv comment4 pages, 1 figure

References in corpus (6)

• Theory of Underdoped Cuprates
• Can correlations drive a band insulator metallic?
• Modulation Doping near Mott-Insulator Heterojunctions
• New mean field theory of the tt't''J model applied to the high-Tc superconductors
• Tunneling spectra of layered strongly correlated d-wave superconductors
• Flux period, spin gap, and pairing in the one-dimensional t-J-J'-model

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• Dynamics of a single exciton in strongly correlated bilayers
• Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model
• Designing Heterostructures with Higher Temperature Superconductivity
• Calculation of generalized spin stiffness constant of strongly correlated doped quantum antiferromagnet on two-dimensional lattice and it's application to effective exchange constant for semi-itinerant systems
• Theoretical investigation of the four-layered self-doped high-T${}_c$ superconductors: evidence of pair tunneling effect
• Linking infinite bond-dimension matrix product states with frustration-free Hamiltonians