Electron-phonon Interaction close to a Mott transition
摘要
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.
引用
@article{arxiv.cond-mat/0409510,
title = {Electron-phonon Interaction close to a Mott transition},
author = {G. Sangiovanni and M. Capone and C. Castellani and M. Grilli},
journal= {arXiv preprint arXiv:cond-mat/0409510},
year = {2007}
}
备注
4 pages, 3 color figures. Slightly revised text and references. Kondo effect result added in Fig. 2 for comparison with DMFT data