Abstract
Electron-holes, phonons, and plasmons come in close proximity to each other in the low-energy range of the excitation spectrum of two-dimensional (2D) crystals, breaking the validity of the weakly interacting-quasiparticles picture. By including the lattice oscillations into the scheme of time-dependent density-functional theory, we open a pathway to the ab initio treatment of the coupled low-energy excitations in 2D crystals. With the use of graphene as an important test system, we find the strong coupling of the elementary excitations, giving rise to new hybrid collective modes. The total (including both the electronic and ionic response) dielectric function epsilon(tot)(omega) is constructed and the picture of the low-energy excitation spectrum of graphene is redrawn.
Keywords
WALLED CARBON NANOTUBES, GRAPHENE, SUPERCONDUCTIVITY, PLASMONS, ENERGY, SYSTEMS, GAS
DOI
10.1103/PhysRevB.89.195423
Date of this Version
5-19-2014
Recommended Citation
Nazarov, Vladimir U.; Alharbi, Fhhad; Fisher, Timothy; and Kais, Sabre, "Time-dependent density functional theory of coupled electronic lattice motion in quasi-two-dimensional crystals" (2014). Birck and NCN Publications. Paper 1631.
http://dx.doi.org/10.1103/PhysRevB.89.195423
Comments
This is the publisher PDF of Nazarov, VU; Alharbi, F; Fisher, TS; Kais, S. "Time-dependent density functional theory of coupled electronic lattice motion in quasi-two-dimensional crystals." Physical Review B, 89, 195423. 2014. Copyright APS, it is available at http://dx.doi.org/10.1103/PhysRevB.89.195423.