Spectral function of the small polaron

Details Spectral function of the small polaron Spectral function of the small polaron

1997-04-29

arxiv.org/abs/cond-mat/9704237v2

Phys. Rev. B, 56 (1997) 13 634

Physics

Condensed Matter

Strongly Correlated Electrons

revtex 3 pages, 6 eps figures. 4 c programs added

Scientific paper

10.1103/PhysRevB.56.13634

We compute exactly both the spectral function of the electron and of the
small polaron for the two site Holstein model. We find that for intermediary
coupling, the small polaron is a better fundamental excitation of the system
than the electron. However, the Lang-Firsov approximation fails to predict the
right dispersion relation for the small polaron.

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