Electron-phonon interaction close to a Mott transition.
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.
Sangiovanni
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G
INFM Statistical Mechanics and Complexity Center, and Dipartimento di Fisica, Università di Roma La Sapienza Piazzale Aldo Moro 5, I-00185 Roma, Italy.
Capone
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Castellani
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C
Grilli
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