论文标题
重新审视的一维荷斯坦模型
The one-dimensional Holstein model revisited
论文作者
论文摘要
我们在半填充时分析了一维荷斯坦模型的全球地基 - 量子（量子）相图，这是电子偶联强度的函数（由声子引起的吸引力的强度表示，$ u $）和声子频率和$ω_0$。除了重新分析各种渐近方案外，我们还进行了密度 - 高质量重新归一化组模拟，以纠正有关抗绝热（大$ω_0$）和强耦合（大$ U $）制度的先前推论。有两个不同的阶段 - 完全间隙的相称的电荷密度波和一个带有无间隙电荷模式的自旋开发的路德 - emery相 - 由相边界隔开，形状反映了弱和强耦合限制中不同显微镜物理的形状。
We analyze the global ground-state (quantum) phase diagram of the one-dimensional Holstein model at half-filling as a function of the strength of the electron-phonon coupling (represented by the strength of the phonon-induced attraction, $U$) and the phonon frequency, $ω_0$. In addition to reanalyzing the various asymptotic regimes, we have carried out density-matrix renormalization group simulations to correct previous inferences concerning the anti-adiabatic (large $ω_0$) and strong coupling (large $U$) regimes. There are two distinct phases - a fully gapped commensurate charge-density-wave and a spin-gapped Luther-Emery phase with a gapless charge mode - separated by a phase boundary, with a shape that reflects different microscopic physics in the weak and strong coupling limits.
