Plasmon electron-hole resonance in epitaxial graphene

verfasst von

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.

Organisationseinheit(en)

Institut für Festkörperphysik

Externe Organisation(en)

Physikalisch-Technische Bundesanstalt (PTB)

Typ

Artikel

Journal

Journal of Physics Condensed Matter

Band

23

ISSN

0953-8984

Publikationsdatum

26.11.2010

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Materialwissenschaften, Physik der kondensierten Materie

Elektronische Version(en)

https://doi.org/10.1088/0953-8984/23/1/012001 (Zugang: Unbekannt)