Phase separation close to the density-driven Mott transition in the Hubbard-Holstein model
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Updated: Aug 24, 2026

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
M Capone1, G Sangiovanni, C Castellani
1Enrico Fermi Center, Rome, Italy.
Abstract:
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 a 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 nonpolaronic metal.
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