Dynamical conductivity of AA-stacked bilayer graphene
arXiv:1208.1698 · doi:10.1103/PhysRevB.86.075439
Abstract
We calculate the dynamical conductivity of AA-stacked bilayer graphene as a function of frequency and in the presence of a finite chemical potential due to charging. Unlike the monolayer, we find a Drude absorption at charge neutrality in addition to an interband absorption with onset of twice the interlayer hopping energy. At finite doping, the interband absorption exhibits two edges which depend on both chemical potential and interlayer hopping energy. We study the behaviour as a function of varying chemical potential relative to the interlayer hopping energy scale and compute the partial optical sum. The results are contrasted with the previously published case of AB-stacking. While we focus on in-plane conductivity, we also provide the perpendicular conductivity for both AB and AA stacking. We also examine conductivity for other variations with AA-stacking, such as AAA-stacked trilayer. Based on proposed models for topological insulators discussed in the literature, we also consider the effect of spin orbit coupling on the optical properties of an AA-stacked bilayer which illustrates the effect of an energy gap opening at points in the band structure.
Accepted in PRB
References in corpus (22)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Two Dimensional Atomic Crystals
- Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
- Measurement of the Optical Conductivity of Graphene
- Asymmetry gap in the electronic band structure of bilayer graphene
- Universal dynamical conductance in graphite
- Space-time dispersion of graphene conductivity
- Single Layer Behavior and Its Breakdown in Twisted Graphene Layers
- Giant Faraday rotation in single- and multilayer graphene
- Unusual Microwave Response of Dirac Quasiparticles in Graphene
- AC conductivity of graphene: from tight-binding model to 2+1-dimensional quantum electrodynamics
- Optical and magneto-optical far-infrared properties of bilayer graphene
- Electronic properties of bilayer and multilayer graphene
- Determination of the electronic structure of bilayer graphene from infrared spectroscopy results
- Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
- Infrared spectroscopy of electronic bands in bilayer graphene
- Optical conductivity of bilayer graphene with and without an asymmetry gap
- Dirac electronic states in graphene systems: Optical spectroscopy studies
- Effect of Holstein phonons on the electronic properties of graphene
- Band topology and quantum spin Hall effect in bilayer graphene
- Emergence of Plasmaronic Structure in the Near Field Optical Response of Graphene