RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

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

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to jqi-comm@umd.edu