Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-01-29
Phys. Rev. B 76, 033414 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures, RevTeX
Scientific paper
10.1103/PhysRevB.76.033414
The smallest fullerene, dodecahedral C20, is studied using a one band Hubbard model parameterized by U/t. Results are obtained using exact diagonalization of matrices with linear dimensions as large as 5.7 x 10^9, supplemented by quantum Monte Carlo. We report the magnetic and spectral properties of C20 as a function of U/t and investigate electronic pair binding. Solid forms of C20 are studied using cluster perturbation theory and evidence is found for a metal-insulator transition at U ~ 4t. We also investigate the relevance of strong correlations to the Jahn-Teller effect in C20.
Berlinsky John A.
Kallin Catherine
Lin Fei
Sørensen Erik S.
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