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Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene

TitleTheory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene
Publication TypeJournal Article
Year of Publication2017
AuthorsX. Li, and W-K. Tse
JournalPHYSICAL REVIEW B
Volume95
Date PublishedFEB 21
ISSN2469-9950
Abstract

We develop a theory for the optical conductivity of doped ABC-stacked multilayer graphene including the effects of electron-electron interactions. Applying the quantum kinetic formalism, we formulate a set of pseudospin Bloch equations that govern the dynamics of the nonequilibrium density matrix driven by an external ac electric field under the influence of Coulomb interactions. These equations reveal a dynamical mechanism that couples theDrude and interband responses arising from the chirality of pseudospin textures in multilayer graphene systems. We demonstrate that this results in an interaction-induced enhancement of the Drude weight and plasmon frequency strongly dependent on the pseudospin winding number. Using bilayer graphene as an example, we also study the influence of higher-energy bands and find that they contribute considerable renormalization effects not captured by a low-energy two-band description. We argue that this enhancement of Drude weight and plasmon frequency occurs generally in materials characterized by electronic chirality.

DOI10.1103/PhysRevB.95.085428