Phase Separation close to the density-driven Mott transition in the Hubbard-Holstein model

C. Castellani; C. Di Castro; G. Sangiovanni; M. Capone; M. Grilli

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Phase Separation close to the density-driven Mott transition in the Hubbard-Holstein model

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arxiv cond-mat/0305699 v2 pith:VL44TOKX submitted 2003-05-30 cond-mat.str-el

M. Capone , G. Sangiovanni , C. Castellani , C. Di Castro , M. Grilli This is my paper · ORCID

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The density driven Mott transition is studied by means of Dynamical Mean-Field Theory in the Hubbard-Holstein model, where the Hubbard term leading to the Mott transition is supplemented by an electron-phonon (e-ph) term. We show that an intermediate e-ph coupling leads to a first-order transition at T=0, which is accompanied by phase separation between a metal and an insulator. The compressibility in the metallic phase is substantially enhanced. At quite larger values of the coupling a polaronic phase emerges coexisting with a non-polaronic metal.

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