Optical and plasmonic properties of twisted bilayer graphene: Impact of interlayer tunneling asymmetry and ground-state charge inhomogeneity
Pietro Novelli, Iacopo Torre, Frank H. L. Koppens, Fabio Taddei, Marco Polini
Abstract
Twisted bilayer graphene (TBG) at twist angles \ensuremath{\theta}\ensuremath{\approx}1\ifmmode^\circ\else\textdegree\fi{} has recently attracted a great deal of interest for its rich transport phenomenology. Here, the authors present a theoretical study of the local optical conductivity, plasmon spectra, and thermoelectric properties of TBG at different filling factors and twist angles. The theory developed by the authors is based on the electronic band structures obtained from a continuum model with two tunable parameters that parametrize the relevant tunneling rates.
Topics & Concepts
Condensed matter physicsBilayer grapheneAsymmetryPlasmonOptical conductivityGround stateQuantum tunnellingThermoelectric effectCharge (physics)PhysicsSpectral lineGrapheneMaterials scienceOpticsQuantum mechanicsGraphene research and applicationsQuantum and electron transport phenomenaSurface and Thin Film Phenomena