Single-particle Excitation Spectra of C$_{60}$ Molecules and Monolayers

Details Single-particle Excitation Spectra of C$_{60}$ Molecules and Monolayers Single-particle Excitation Spectra of C$_{60}$ Molecules and Monolayers

2006-10-30

arxiv.org/abs/cond-mat/0610823v2

Phys. Rev. B 75, 075112 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages

Scientific paper

In this paper we present calculations of single-particle excitation spectra of neutral and three-electron-doped Hubbard C$_{60}$ molecules and monolayers from large-scale quantum Monte Carlo simulations and cluster perturbation theory. By a comparison to experimental photoemission, inverse photoemission, and angle-resolved photoemission data, we estimate the intermolecular hopping integrals and the C$_{60}$ molecular orientation angle, finding agreement with recent X-ray photoelectron diffraction (XPD) experiments. Our results demonstrate that a simple effective Hubbard model, with intermediate coupling, $U=4t$, provides a reasonable basis for modeling the properties of C$_{60}$ compounds.

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