Renormalization of the electron–phonon i
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R. Citro; S. Cojocaru; M. Marinaro
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Article
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2005
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Elsevier Science
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English
⚖ 165 KB
We calculate the electron-phonon vertex in the two-dimensional Hubbard model by a strong coupling approach based on cumulant expansion. The role of the on-site Coulomb interaction on the coupling of the electrons to the Holstein phonons is investigated in different regions of the Brillouin zone. The