Mott transition in Kagomé lattice Hubbard model

Details Mott transition in Kagomé lattice Hubbard model Mott transition in Kagomé lattice Hubbard model

2006-03-22

arxiv.org/abs/cond-mat/0603596v1

Phys. Rev. Lett. 97, 066401 (2006).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.97.066401

We investigate the Mott transition in the Kagom\'e lattice Hubbard model using a cluster extension of dynamical mean field theory. The calculation of the double occupancy, the density of states, the static and dynamical spin correlation functions demonstrates that the system undergoes the first-order Mott transition at the Hubbard interaction $U/W \sim 1.4$ ($W$:bandwidth). In the metallic phase close to the Mott transition, we find the strong renormalization of three distinct bands, giving rise to the formation of heavy quasiparticles with strong frustration. It is elucidated that the quasiparticle states exhibit anomalous behavior in the temperature-dependent spin correlation functions.

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