Electron-phonon Interaction close to a Mott transition

Details Electron-phonon Interaction close to a Mott transition Electron-phonon Interaction close to a Mott transition

2004-09-20

arxiv.org/abs/cond-mat/0409510v2

Phys. Rev. Lett. 94, 026401 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 color figures. Slightly revised text and references. Kondo effect result added in Fig. 2 for comparison with DMFT d

Scientific paper

10.1103/PhysRevLett.94.026401

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.

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