A phenomenological approach is proposed to derive plasmon energies for C materials as a function of mass density q and sp2 fraction f. It is shown that the energy of the graphite in-plane (p and p + r) and out-of-plane plasmons, as well as the energy of the diamond bulk (r) plasmon are correctly reproduced by the model. Crucial factors in this respect – and responsible for the deviation from a free electron picture – are the energy of interband transitions associated with plasmon excitation and the screening of p electrons due to r electron polarization. Plasmon energies, derived as a function of q and f, are discussed.

Plasmon features in electron energy loss spectra from carbon materials

Calliari, Lucia;Filippi, Massimiliano
2007-01-01

Abstract

A phenomenological approach is proposed to derive plasmon energies for C materials as a function of mass density q and sp2 fraction f. It is shown that the energy of the graphite in-plane (p and p + r) and out-of-plane plasmons, as well as the energy of the diamond bulk (r) plasmon are correctly reproduced by the model. Crucial factors in this respect – and responsible for the deviation from a free electron picture – are the energy of interband transitions associated with plasmon excitation and the screening of p electrons due to r electron polarization. Plasmon energies, derived as a function of q and f, are discussed.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11582/3530
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
social impact