Plasmon electron-hole resonance in epitaxial graphene

authored by

Christoph Tegenkamp, Herbert Pfnür, Thomas Langer, J. Baringhaus, H. W. Schumacher

Abstract

The quasiparticle dynamics of the sheet plasmons in epitaxially grown graphene layers on SiC(0001) has been studied systematically as a function of temperature, intrinsic defects, influence of multilayers and carrier density using electron energy loss spectroscopy with high energy and momentum resolution. The opening of an inter-band decay channel appears as an anomalous kink in the plasmon dispersion which we describe as a resonance effect in the formation of electron-hole pairs. Due to the inevitable strong coupling of plasmons with single particle excitations in reduced dimensions, such signatures are generally expected.

Organisation(s)

Institute of Solid State Physics

External Organisation(s)

Physikalisch-Technische Bundesanstalt PTB

Type

Article

Journal

Journal of Physics Condensed Matter

Volume

23

ISSN

0953-8984

Publication date

26.11.2010

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Materials Science, Condensed Matter Physics

Electronic version(s)

https://doi.org/10.1088/0953-8984/23/1/012001 (Access: Unknown)