Mott transition in Kagomé lattice Hubbard model

Abstract

We investigate the Mott transition in the Kagomé 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.

4 pages, 6 figures

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• Quantum Cluster Theories
• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Cellular Dynamical Mean Field Approach to Strongly Correlated Systems
• Cluster Dynamical Mean Field analysis of the Mott transition
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• Magnetic correlations in the Hubbard model on triangular and Kagome lattices
• Thermoelectric properties of the degenerate Hubbard model
• Low-energy excitations of the Hubbard model on the Kagomé lattice

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