论文标题
拓扑正方形晶格上相互作用的Chern绝缘子的自发对称破坏
Spontaneous symmetry breaking of an interacting Chern insulator on a topological square lattice
论文作者
论文摘要
拓扑与相关性之间的相互作用在于现代冷凝物理物理学的最前沿。在本文中，我们在支持Chern绝缘子的拓扑平方晶格上研究了扩展的费米亚 - 哈伯德模型，包括现场和最近的邻居排斥相互作用。在平均场方法中，我们发现自发对称性断裂（SSB）电荷密度波或抗磁性绝缘体在现场或最近的邻居相互作用足够强时会主导系统。有趣的是，当存在明显的非散型sublattice电位时，抗磁性Chern绝缘子将出现在相图中。此外，我们探讨了有限大小的色带结构如何影响相图，并指出SSB的临界相互作用的强度较弱，而强度较弱。
The interplay between topology and correlation lies at the forefront of modern condensed matter physics. In this paper, we study the extended fermion-Hubbard model, including the on-site as well as the nearest-neighbor repulsive interactions, on a topological square lattice that supports the Chern insulator. Within the mean-field method, we find that the spontaneous symmetry breaking (SSB) charge-density wave or antiferromagnetic insulator dominates the system when the onsite or nearest-neighbor interactions are strong enough. It is interesting that the antiferromagnetic Chern insulator will appear in the phase diagram when there is an explicitly nonvanishing sublattice potential. In addition, we explore how a finite-size ribbon structure affects the phase diagram and point out that the critical interaction for SSB occurs with weaker strength than the bulk system.
