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- W2013264728 abstract "The one-electron spectral function of the one-dimensional spin-$1∕2$ Holstein model at half filling is computed by use of the cluster perturbation theory. The cluster Green's function is obtained by the Lanczos exact diagonalization method within an optimized phonon approach. It is shown that the method allows reliable calculations using a relatively small size cluster and a few optimal phonon bases for the system from weak to strong electron-phonon coupling. In the strong-coupling limit, the spectral function shows the excitation behavior of a bipolaron state with a large gap at the Fermi surface. However, the obtained spectral function displays a metallic character in the weak-coupling regime, which is in accord with the suggestion that the Peierls gap is suppressed by quantum fluctuation of the phonons." @default.
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- W2013264728 date "2005-03-07" @default.
- W2013264728 modified "2023-09-27" @default.
- W2013264728 title "Spectral function of the one-dimensional Holstein model at half filling" @default.
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- W2013264728 doi "https://doi.org/10.1103/physrevb.71.115201" @default.
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