TY - JOUR
T1 - Multiple satellites in materials with complex plasmon spectra
T2 - From graphite to graphene
AU - Guzzo, Matteo
AU - Kas, Joshua J.
AU - Sponza, Lorenzo
AU - Giorgetti, Christine
AU - Sottile, Francesco
AU - Pierucci, Debora
AU - Silly, Mathieu G.
AU - Sirotti, Fausto
AU - Rehr, John J.
AU - Reining, Lucia
PY - 2014/2/27
Y1 - 2014/2/27
N2 - The photoemission spectrum of graphite is still debated. To help resolve this issue, we present photoemission measurements at high photon energy and analyze the results using a Green's function approach that takes into account the full complexity of the loss spectrum. Our measured data show multiple satellite replicas. We demonstrate that these satellites are of intrinsic origin, enhanced by extrinsic losses. The dominating satellite is due to the π+σ plasmon of graphite, whereas the π plasmon creates a tail on the high-binding energy side of the quasiparticle peak. The interplay between the two plasmons leads to energy shifts, broadening, and additional peaks in the satellite spectrum. We also predict the spectral changes in the transition from graphite towards graphene.
AB - The photoemission spectrum of graphite is still debated. To help resolve this issue, we present photoemission measurements at high photon energy and analyze the results using a Green's function approach that takes into account the full complexity of the loss spectrum. Our measured data show multiple satellite replicas. We demonstrate that these satellites are of intrinsic origin, enhanced by extrinsic losses. The dominating satellite is due to the π+σ plasmon of graphite, whereas the π plasmon creates a tail on the high-binding energy side of the quasiparticle peak. The interplay between the two plasmons leads to energy shifts, broadening, and additional peaks in the satellite spectrum. We also predict the spectral changes in the transition from graphite towards graphene.
U2 - 10.1103/PhysRevB.89.085425
DO - 10.1103/PhysRevB.89.085425
M3 - Article
AN - SCOPUS:84897735025
SN - 1098-0121
VL - 89
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 8
M1 - 085425
ER -