论文标题
反映两种频率penrose-Hubbard模型中电子状态的激子凝结
Excitonic condensation reflecting electronic states in two-band Penrose-Hubbard model
论文作者
论文摘要
我们研究了Penrose瓷砖上的两种频段哈伯德模型中的激子绝缘（EI）阶段。通过系统地执行真实空间平均场计算，我们获得了顶点和中心模型的基态相图。我们发现，在某些方案中，稳定的EI阶段是由小带相互作用引起的。我们认为，这起源于完全或几乎退化状态的电子孔配对，这是Penrose瓷砖的特征。我们还研究了顺序参数的空间分布，将其映射到垂直空间。
We study the excitonic insulating (EI) phase in the two-band Hubbard models on the Penrose tiling. Performing the real-space mean-field calculations systematically, we obtain the ground state phase diagrams for the vertex and center models. We find that, in some regimes, the stable EI phase is induced by small interband interactions. We argue that this originates from the electron-hole pairing for the completely or nearly degenerate states, which are characteristic of the Penrose tiling. We also study spatial distribution of the order parameter, mapping it to the perpendicular space.
