Filling dependence of the Mott transition in the degenerate Hubbard model

Details Filling dependence of the Mott transition in the degenerate Hubbard model Filling dependence of the Mott transition in the degenerate Hubbard model

1999-05-25

arxiv.org/abs/cond-mat/9905351v1

Phys.Rev.B <b>60</b>, 15714 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages RevTeX with 10 eps figures, additional material available at http://www.mpi-stuttgart.mpg.de/docs/ANDERSEN/fullerene/

Scientific paper

10.1103/PhysRevB.60.15714

Describing the doped Fullerenes using a generalized Hubbard model, we study the Mott transition for different integer fillings of the t_1u band. We use the opening of the energy-gap E_g as a criterion for the transition. E_g is calculated as a function of the on-site Coulomb interaction U using fixed-node diffusion Monte Carlo. We find that for systems with doping away from half-filling the Mott transitions occurs at smaller U than for the half-filled system. We give a simple model for the doping dependence of the Mott transition.

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