Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany.
Phys Rev Lett. 2012 Sep 14;109(11):116407. doi: 10.1103/PhysRevLett.109.116407. Epub 2012 Sep 13.
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. Nonlocal interactions suppress the Peierls instability, and thereby lead to almost degenerate power-law exponents for charge and pairing correlations.
我们证明了具有非局域相互作用的费米子-玻色子模型可以在有限能带填充下使用连续时间量子蒙特卡罗方法进行模拟。我们应用这种方法来探索一维半满能带中电子-声子相互作用范围的影响，涵盖了从 Holstein 到 Fröhlich 区的整个范围。相图包含金属、Peierls 和相分离区域。非局域相互作用抑制了 Peierls 不稳定性，从而导致电荷和配对相关的幂律指数几乎简并。
