Spatially-indirect Exciton Condensate Phases in Double Bilayer Graphene

Abstract

We present a theory of spatially indirect exciton condensate states in systems composed of a pair of electrically isolated Bernal graphene bilayers. The ground state phase diagram in a two-dimensional displacement-field/inter-bilayer-bias space includes layer-polarized semiconductors, spin-density-wave states, exciton condensates, and states with mixed excitonic and spin order. We find that two different condensate states, distinguished by a chirality index, are stable under different electrical control conditions.

arXiv comment15 pages, 20 figures

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• Excitonic Instability and Pseudogap Formation in Nodal Line Semimetal ZrSiS
• Quantum signature of exciton condensation
• Quantum-metric-enabled exciton condensate in double twisted bilayer graphene
• Theory of Coulomb Drag in Spatially Inhomogeneous Materials
• Complexes of dipolar excitons in layered quasi-two-dimensional nanostructures
• Multicomponent screening and superfluidity in gapped electron-hole double bilayer graphene with realistic bands
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• Josephson-like tunnel resonance and large Coulomb drag in GaAs-based electron-hole bilayers
• Exciton-Peierls mechanism and universal many-body gaps in carbon nanotubes
• Electron-hole superfluidity controlled by a periodic potential
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• Anderson-Bogoliubov and Carlson-Goldman modes in counterflow superconductors: Case study of a double monolayer graphene
• Topological fluctuating electron-hole Cooper pairs in graphene-GaAs heterostructures
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• Applied electric and magnetic field effects on the bandgap formation and antiferromagnetic ordering in AA-stacked Bilayer Graphene