Diamagnetism and suppression of screening as hallmarks of electron-hole pairing in a double layer graphene system
arXiv:1412.5132 · doi:10.1103/PhysRevB.91.115442
Abstract
We study how the electron-hole pairing reveals itself in the response of a double layer graphene system to the vector and scalar potentials. Electron-hole pairing results in a rigid (London)relation between the current and the difference of vector potentials in two adjacent layers. The diamagnetic effect can be observed in multiple connected systems in the magnetic field parallel to the graphene layers. Such an effect would be considered as a hallmark of the electron-hole pairing, but the value of the effect is extremely small. Electron-hole pairing significantly changes the response to the scalar potential, as well. It results in a complete (at zero temperature) or partial (at finite temperature) suppression of screening of the electric field of a test charge situated at some distance to the double layer system. A strong increase of the electric field induced by the test charge under decrease in temperature can be considered as a spectacular hallmark of the electron-hole pairing.
refs. are added, published version
References in corpus (14)
- The electronic properties of graphene
- Dielectric function, screening, and plasmons in 2D graphene
- Strong Coulomb drag and broken symmetry in double-layer graphene
- Room-Temperature Superfluidity in Graphene Bilayers
- Exciton Condensation and Perfect Coulomb Drag
- Screening, Kohn anomaly, Friedel oscillation, and RKKY interaction in bilayer graphene
- Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers
- Electron screening and excitonic condensation in double-layer graphene systems
- Anomalous Coulomb drag in electron-hole bilayers
- Linear response of doped graphene sheets to vector potentials
- Cooper pairing of electrons and holes in graphene bilayer: Correlation effects
- Interaction-Enhanced Coherence Between Two-Dimensional Dirac Layers
- Vortices, zero modes and fractionalization in bilayer-graphene exciton condensate
- Enhancement of electron-hole superfluidity in double few-layer graphene