论文标题
荷斯坦 - 哈伯德模型的强耦合极限
Strong Coupling Limit of the Holstein-Hubbard Model
论文作者
论文摘要
我们使用渐近精确的强耦合膨胀分析了荷斯坦 - 哈伯德模型的量子相图。我们发现各种有趣的阶段，包括配对密度波（PDW），电荷4E（甚至是电荷6E）超导体，相分离的制度以及各种不同的电荷密度波（CDW），旋转密度波（SDW）和超导式制度。我们绘制出随延迟程度的函数而发生的交叉，即特征声子频率与相互作用强度的比率。
We analyze the quantum phase diagram of the Holstein-Hubbard model using an asymptotically exact strong-coupling expansion. We find all sorts of interesting phases including a pair-density wave (PDW), a charge 4e (and even a charge 6e) superconductor, regimes of phase separation, and a variety of distinct charge-density-wave (CDW), spin-density-wave (SDW) and superconducting regimes. We chart the crossovers that occur as a function of the degree of retardation, i.e. the ratio of characteristic phonon frequency to the strength of interactions.
