Excitation spectra and spin gap of the half-filled Holstein-Hubbard model

Article

关键词: MOLECULAR-CRYSTAL MODEL;    METAL-INSULATOR-TRANSITION;    PHASE-DIAGRAM;    PEIERLS-INSULATOR;    POLARON MOTION;    ONE-DIMENSION;    1D;    STATE;    BAND;   

DOI  :  10.1103/PhysRevB.87.075149

来源: SCIE

【 摘 要 】

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. DOI: 10.1103/PhysRevB.87.075149

【 授权许可】

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