Phase Separation Close to the Density-Driven Mott Transition in the Hubbard-Holstein Model

2003/05/31 by Massimo Capone, M. Capone, Giorgio Sangiovanni +4 · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.92.106401

published as Phys. Rev. Lett. 92, 106401 (2004) · 4 pages, 3 figures. Slightly revised text. More details in Fig.1 and 2. Smaller size version of Fig.3

arxiv created 2004/01/28 · openalex publication_date 2004/03/10 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

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.

Citations

• The small-polaron crossover: Comparison between exact results and vertex correction approximation
• Strongly Correlated Superconductivity

Cited by

• Electron-Phonon Interaction Close to a Mott Transition
• Electron-Phonon Interaction and Antiferromagnetic Correlations
• Effective electron-phonon coupling and polaronic transition in the presence of strong correlation
• Relevance of phonon dynamics in strongly correlated systems coupled to phonons: Dynamical mean-field theory analysis