Abstract
We have determined the electronic bandstructure of clean and potassium-doped single layer graphene, and fitted the graphene π bands to a first- and third-nearest-neighbor tight binding model. We characterized the quasiparticle dynamics using angle resolved photoemission spectroscopy. The dynamics reflect the decay of quasiparticles (holes) into collective excitations, namely plasmons, phonons, and electron–hole pairs. Electron–hole pair decay is found to be a minimum at the Dirac energy E D while electron–plasmon scattering is maximum around the same energy. Taking the topology of the bands around the Dirac energy for n -doped graphene into account, we show that these results follow from kinematic constraints imposed by graphene’s gapless energy spectrum around the Dirac energy. We also show that the electron–phonon scattering in lightly doped graphene is around 6 times larger than the predictions of published calculations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
