Multiple satellites in materials with complex plasmon spectra: From graphite to graphene

Matteo Guzzo (1, 2) , Joshua J. Kas (3) , Lorenzo Sponza (1, 2) , Christine Giorgetti (1, 2) , Francesco Sottile (1, 2) , Debora Pierucci (4) , Mathieu G. Silly (4) , Fausto Sirotti (4) , John J. Rehr (2, 3) , Lucia Reining (1, 2)

1 LSI - Laboratoire des Solides Irradiés
2 ETSF - European Theoretical Spectroscopy Facility
3 Department of Physics, University of Washington
4 SSOLEIL - Synchrotron SOLEIL

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.

Domains: Physics [physics]; Condensed Matter [cond-mat]; Other [cond-mat.other]

Matteo Guzzo, Joshua J. Kas, Lorenzo Sponza, Christine Giorgetti, Francesco Sottile, et al.. Multiple satellites in materials with complex plasmon spectra: From graphite to graphene. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 89, pp.085425. ⟨10.1103/PhysRevB.89.085425⟩. ⟨hal-01011562⟩