Interplay of Site and Bond Electron-Phonon Coupling in One Dimension
arXiv:1610.02426 · doi:10.1103/PhysRevLett.117.206404
Abstract
The interplay of bond and charge correlations is studied in a one-dimensional model with both Holstein and Su-Schrieffer-Heeger (SSH) couplings to quantum phonons. The problem is solved exactly by quantum Monte Carlo simulations. If one of the couplings dominates, the ground state is a Peierls insulator with long-range bond or charge order. At weak coupling, the results suggest a spin-gapped and repulsive metallic phase arising from the competing order parameters and lattice fluctuations. Such a phase is absent from the pure SSH model even for quantum phonons. At strong coupling, evidence for a continuous transition between the two Peierls states is presented.
5 pages, final version
References in corpus (8)
- Diagrammatic Determinantal methods: projective schemes and applications to the Hubbard-Holstein model
- Phase diagram of the one-dimensional half-filled extended Hubbard model
- Metallicity in the half-filled Holstein-Hubbard model
- Phase diagram of the one dimensional Hubbard-Holstein Model at 1/2 and 1/4 filling
- Excitation spectra and spin gap of the half-filled Holstein-Hubbard model
- Excitation spectra and correlation functions of quantum Su-Schrieffer-Heeger models
- Nature of ground states in one-dimensional electron-phonon Hubbard models at half-filling
- Dynamic charge correlations near the Peierls transition