Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 49: Electronic structure IV
O 49.1: Vortrag
Freitag, 31. März 2006, 11:15–11:30, WIL B321
Self-energy and many-body effects in graphite — •S. Bengiò1, T. K. Kim1, Ph. Hofmann1, A. Leonardo2, and E. V. Chulkov2 — 1Institute for Storage Ring Facilities and iNano Center, University of Aarhus, 8000 Aarhus C, Denmark — 2Donostia International Physics Center (DIPC), 20018 San Sebastián / Donostia, Basque Country, Spain
Graphite is a semimetal, a prototype of layered crystals and the parent compound for carbon nanotubes. Despite of its great importance, detailed studies of many body effects by angle-resolved photoemission (ARPES) are rare, mostly caused by the lack of high-quality samples. Here we present an ARPES study on high-quality graphite films grown on a SiC substrate. The temperature dependence of the self energy was determined by a systematic linewidth analysis for the Fermi surface states close to the K point of the surface Brillouin zone. The Fermi surface crossing is sharp in momentum space (of the order of 0.07 Å−1) and its full width at half maximum is almost constant for temperatures between 70 and 600 K. The experimental results for the self-energy are compared to first principles calculations for one layer of graphene.