Effect of Electron-Phonon Interaction Range for a Half-Filled Band in One Dimension
arXiv:1205.0612 · doi:10.1103/PhysRevLett.109.116407
Abstract
We demonstrate that fermion-boson models with nonlocal interactions can be simulated at finite band filling with the continuous-time quantum Monte Carlo method. We apply this method to explore the influence of the electron-phonon interaction range for a half-filled band in one dimension, covering the full range from the Holstein to the Fröhlich regime. The phase diagram contains metallic, Peierls, and phase-separated regions, which we characterize in terms of static and dynamical correlation functions. In particular, our results reveal a suppression of charge correlations with increasing interaction range, allowing for a power-law decay comparable to the pairing correlations.
5 pages, 5 figures
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