Electron-Phonon Interaction Close to a Mott Transition

2004/09/30 by Giorgio Sangiovanni, G. Sangiovanni, Massimo Capone +3 · 4 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.94.026401

published as Phys. Rev. Lett. 94, 026401 (2005) · 4 pages, 3 color figures. Slightly revised text and references. Kondo effect result added in Fig. 2 for comparison with DMFT data

openalex publication_date 2005/01/18 · arxiv created 2005/01/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The effect of Holstein electron-phonon interaction on a Hubbard model close to a Mott-Hubbard transition at half filling is investigated by means of dynamical mean-field theory. We observe a reduction of the effective mass that we interpret in terms of a reduced effective repulsion. When the repulsion is rescaled to take into account this effect, the quasiparticle low-energy features are unaffected by the electron-phonon interaction. Phonon features are only observed within the high-energy Hubbard bands. The lack of electron-phonon fingerprints in the quasiparticle physics can be explained interpreting the quasiparticle motion in terms of rare fast processes.

Citations

• First- and second-order phase transitions in the Holstein-Hubbard model
• Dynamical mean-field theory of the Hubbard-Holstein model at half filling: Zero temperature metal-insulator and insulator-insulator transitions
• Polaron Crossover and Bipolaronic Metal-Insulator Transition in the Half-Filled Holstein Model
• Phase Separation Close to the Density-Driven Mott Transition in the Hubbard-Holstein Model
• Many Body Effects on the Transport Properties of Single-Molecule Devices
• Strongly Correlated Superconductivity

Cited by

• 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
• Isotope effects in the Hubbard-Holstein model within dynamical mean-field theory