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- W2064292004 abstract "Single-- and two-particle excitation spectra of the one-dimensional, half-filled Holstein-Hubbard model are calculated using the continuous-time quantum Monte Carlo method. In the metallic phase, the results are consistent with a Luther-Emery liquid that has gapped spin and single-particle excitations but a gapless charge mode. However, given the initially exponential dependence of the spin gap on the backscattering matrix element, the numerical excitation spectra appear gapless in the weak-coupling regime, and therefore resemble those of a Luttinger liquid. The Mott phase has the expected charge gap and gapless spin excitations. The Peierls state shows a charge, spin and single-particle gap, a soft phonon mode, backfolded shadow bands and soliton excitations. Arguments and numerical evidence for the existence of a nonzero spin gap throughout the metallic phase are provided in terms of equal-time spin and charge correlation functions." @default.
- W2064292004 created "2016-06-24" @default.
- W2064292004 creator A5003556379 @default.
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- W2064292004 date "2013-02-28" @default.
- W2064292004 modified "2023-10-18" @default.
- W2064292004 title "Excitation spectra and spin gap of the half-filled Holstein-Hubbard model" @default.
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- W2064292004 doi "https://doi.org/10.1103/physrevb.87.075149" @default.
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