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Electron-phonon coupling in graphene antidot lattices: An indication of polaronic behavior

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Vukmirovic Nenad, Stojanovic Vladimir M., Vanevic Mihajlo,
Project Quantum coherence, quantum statistics, and superconductivity in mesoscopic systems
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Original article (peer-reviewed)

Journal PHYSICAL REVIEW B
Volume (Issue) 81(4)
Page(s) 041408 - 041408
Title of proceedings PHYSICAL REVIEW B

Abstract

We study graphene antidot lattices-superlattices of perforations (antidots) in a graphene sheet-using a model that accounts for the phonon modulation of the pi-electron hopping integrals. We calculate the phonon spectra of selected antidot lattices using two different semiempirical methods. Based on the adopted model, we quantify the nature of charge carriers in the system by computing the quasiparticle weight due to the electron-phonon interaction for an excess electron in the conduction band. We find a very strong phonon-induced renormalization, with the effective electron masses exhibiting nonmonotonic dependence on the superlattice period for a given antidot diameter. Our study provides an indication of polaronic behavior and points to the necessity of taking into account the inelastic degrees of freedom in future studies of transport in graphene antidot lattices.
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