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METAL-INSULATOR TRANSITION OF THE SPINLESS FERMIONS ON THE KAGOME LATTICE

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Nakamura,  M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Nishimoto,  S.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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O'Brien,  A.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

/persons/resource/persons184507

Fulde,  P.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Nakamura, M., Nishimoto, S., O'Brien, A., & Fulde, P. (2011). METAL-INSULATOR TRANSITION OF THE SPINLESS FERMIONS ON THE KAGOME LATTICE. Modern Physics Letters B, 25(12-13 Sp. Iss. SI), 947-953.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-8CB1-9
Abstract
We discuss the metal-insulator transition of the spinless farm ion model with nearest-neighbor repulsion on the Kagome lattice at 1/3- and 2/3-filling. The system is analyzed by using exact diagonalization, the density-matrix renormalization group methods and the random phase approximation. In the strong-coupling region, the system is described by ring exchange processes. In the intermediate-coupling regime, we find that the qualitative properties of the metal-insulator transition at 1/3- and 2/3-filling are totally different reflecting the difference in the band structure near the Fermi level.