Density fluctuation effects on the exciton condensate in double layer graphene
arXiv:1206.0741 · doi:10.1103/PhysRevB.86.161412
Abstract
We describe the robustness of an excitonic condensate in double layer graphene against layer density fluctuations and the associated charge inhomogeneity, and discuss the implications for observing the condensate under current experimental conditions. We solve the mean-field equations for a finite imbalance in the Fermi energies in each layer and utilize the results in two phenomenological models for inhomogeneity. We find that the stability of the excitonic condensate against density fluctuations is strongly dependent on the size of the excitonic gap, and that transport experiments (such as Coulomb drag) which rely on percolation of the exciton current through the inhomogeneous sample are promising methods for observing the condensate.
5 pages, 4 figures, RevTeX
References in corpus (26)
- Boron nitride substrates for high-quality graphene electronics
- Dielectric function, screening, and plasmons in 2D graphene
- Observation of Electron-Hole Puddles in Graphene Using a Scanning Single Electron Transistor
- STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
- Bose-Einstein Condensation of Excitons in Bilayer Electron Systems
- Origin of Spatial Charge Inhomogeneity in Graphene
- Periodically rippled graphene: growth and spatially resolved electronic structure
- Tunable metal-insulator transition in double-layer graphene heterostructures
- Room-Temperature Superfluidity in Graphene Bilayers
- Spatially resolved spectroscopy of monolayer graphene on SiO2
- Is Graphene a Fermi Liquid?
- BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
- Coulomb Drag of Massless Fermions in Graphene
- Ground-state of graphene in the presence of random charged impurities
- Excitonic condensation of massless fermions in graphene bilayers
- Electron screening and excitonic condensation in double-layer graphene systems
- Electron-hole puddles in the absence of charged impurities
- Density-Functional Theory of Graphene Sheets
- Interaction-Enhanced Coherence Between Two-Dimensional Dirac Layers
- Superfluidity at the BEC-BCS crossover in two-dimensional Fermi gases with population and mass imbalance
- Excitonic condensation in a double-layer graphene system
- Influence of Disorder on Electron-Hole Pair Condensation in Graphene Bilayers
- Inhomogenous electronic structure, transport gap, and percolation threshold in disordered bilayer graphene
- The Influence of Remote Bands on Exciton Condensation in Double-Layer Graphene
- Electron-electron and electron-hole pairing in graphene structures
- Compressibility of graphene
Cited by in corpus (15)
- Enhancement of electron-hole superfluidity in double few-layer graphene
- Lasing of Moiré Trapped MoSe/WSe Interlayer Excitons Coupled to a Nanocavity
- Interlayer excitonic superfluidity in graphene
- Chiral superfluid states in hybrid graphene heterostructures
- Gapped phase in AA stacked bilayer graphene
- Ground state of graphene heterostructures in the presence of random charged impurities
- Coulomb drag and counterflow Seebeck coefficient in bilayer-graphene double layers
- Excitonic gap formation and condensation in the bilayer graphene structure
- Excitonic condensation in spatially separated one-dimensional systems
- Drag effect and Cooper electron-hole pair fluctuations in a topological insulator film
- Eliashberg theory for dynamical screening in bilayer exciton condensation
- Broken symmetry and competing orders in Weyl semimetal interfaces
- True exciton condensate of one-dimensional electrons through interwire tunneling
- Energetic comparison of exciton gas versus electron-hole plasma in a bilayer two-dimensional electron-hole system
- Density of states in the bilayer graphene with the excitonic pairing interaction