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

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

2003-05-30

arxiv.org/abs/cond-mat/0305699v2

Phys. Rev. Lett. 92, 106401 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Slightly revised text. More details in Fig.1 and 2. Smaller size version of Fig.3

Scientific paper

10.1103/PhysRevLett.92.106401

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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