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Electron--electron correlation in graphite

Alexander Gruneis 1Claudio Attaccalite 2Ludger Wirtz 2Thomas Pichler 1Angel Rubio 3

1. Leibniz-Institute for Solid State and Materials Research, P.O.Box 270116, Dresden D-01171, Germany
2. Institute for Electronics and Nanotechnology, Lille 60069, France
3. ETSF, San Sebastian 20018, Spain

Abstract

The full three--dimensional dispersion of the pi-bands, Fermi
velocities and effective masses are measured with angle--resolved
photoemission spectroscopy and compared to first-principles
calculations. The band structure by density-functional theory
strongly underestimates the slope of the bands and the trigonal
warping effect. Including electron-electron calculation on the
level of the GW approximation, however, yields remarkable
agreement in the vicinity of the Fermi level. This demonstrates
the breakdown of the independent electron picture in semi-metallic
graphite and points towards a pronounced role of electron
correlation for the interpretation of transport experiments and
double-resonant Raman scattering for a wide range of carbon based
materials.

 

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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium I, by Alexander Gruneis
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-06-08 11:59
Revised:   2009-06-07 00:44