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Coherent potential approximation study of the Mott transition in optical lattice system with site-dependent interactions

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Abstract

We study the Mott transition in the half-filled Hubbard model with spatially alternating interactions by means of the coherent potential approximation. The phase boundary between metallic and insulating phases at zero temperature is derived and the nature of the Mott states is also considered. Our results are in good agreement with the ones recently obtained by the two-site dynamical mean-field theory.

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Correspondence to Duc-Anh Le.

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Le, DA., Tran, TTT. & Hoang, AT. Coherent potential approximation study of the Mott transition in optical lattice system with site-dependent interactions. Eur. Phys. J. B 86, 503 (2013). https://doi.org/10.1140/epjb/e2013-40896-1

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  • DOI: https://doi.org/10.1140/epjb/e2013-40896-1

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