Angle-resolved photoemission spectra of graphene from first-principles calculations.
Angle-resolved photoemission spectroscopy (ARPES) is a powerful experimental technique for directly probing electron dynamics in solids. The energy versus momentum dispersion relations and the associated spectral broadenings measured by ARPES provide a wealth of information on quantum many-body interaction effects. In particular, ARPES allows studies of the Coulomb interaction among electrons (electron-electron interactions) and the interaction between electrons and lattice vibrations (electron-phonon interactions). Here, we report ab initio simulations of the ARPES spectra of graphene including both electron-electron and electron-phonon interactions on the same footing. Our calculations reproduce some of the key experimental observations related to many-body effects, including the indication of a mismatch between the upper and lower halves of the Dirac cone.
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Cheol-Hwan
CH
Park
Feliciano
F
Giustino
Catalin D
CD
Spataru
Marvin L
ML
Cohen
Steven G
SG
Louie
D003198:Computer Simulation; D006108:Graphite / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry*; D056951:Photoelectron Spectroscopy / Q000379:methods*; D017785:Photons; D012542:Scattering, Radiation
D006108:Graphite