High-energy collective electronic excitations in free-standing single-layer graphene - École polytechnique Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2013

High-energy collective electronic excitations in free-standing single-layer graphene

Abstract

In this joint experimental and theoretical work, we investigate collective electronic excitations (plasmons) in free-standing, single-layer graphene. The energy- and momentum-dependent electron energy-loss function was measured up to 50eV along two independent in-plane symmetry directions (ΓM and ΓK) over the first Brillouin zone by momentum-resolved electron energy-loss spectroscopy in a transmission electron microscope. We compare our experimental results with corresponding time-dependent density-functional theory calculations. For finite momentum transfers, good agreement with experiments is found if crystal local-field effects are taken into account. In the limit of small and vanishing momentum transfers, we discuss differences between calculations and the experimentally obtained electron energy-loss functions of graphene due to a finite momentum resolution and out-of-plane excitations.
No file

Dates and versions

hal-00931224 , version 1 (15-01-2014)

Identifiers

Cite

P. Wachsmuth, R. Hambach, Mk Kinyanjui, Matteo Guzzo, G. Benner, et al.. High-energy collective electronic excitations in free-standing single-layer graphene. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 88, pp.075433. ⟨10.1103/PhysRevB.88.075433⟩. ⟨hal-00931224⟩
188 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More