Spatially-indirect Exciton Condensate Phases in Double Bilayer Graphene
arXiv:1611.06410 · doi:10.1103/PhysRevB.95.045416
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.
15 pages, 20 figures
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- Josephson-like tunnel resonance and large Coulomb drag in GaAs-based electron-hole bilayers
- Applied electric and magnetic field effects on the bandgap formation and antiferromagnetic ordering in AA-stacked Bilayer Graphene
- Anomalous drag in electron-hole condensates with granulated order