相互作用介导的反常磁性与拓扑的共存
Interaction-mediated Co-existence of Altermagnetism and Topology
浏览论文内容
中文总结 AI 辅助
该研究通过扩展Hubbard模型结合无限制Hartree-Fock理论与精确对角化，证实Lieb晶格中电子填充为2和4时，相互作用可介导反常磁性与拓扑共存，且反演对称破缺项可诱导二阶拓扑相。
中文摘要 AI 辅助
我们研究了Lieb晶格上电子填充为2和4的扩展Hubbard模型，证明相互作用会导致反常磁性序和拓扑能隙同时出现。采用无限制Hartree-Fock理论，我们计算了反常磁性和拓扑序参数，表明它们在相图的大区域内共存，并伴随量子自旋霍尔效应，我们还通过精确对角化进一步验证了这一点。此外，我们证明反演对称破缺项也可介导具有相关角模式的二阶拓扑相。
英文摘要
We study an extended Hubbard model on Lieb lattice at electron filling 2 and 4, and demonstrate that the interactions lead to the simultaneous emergence of altermagnetic order and a topological gap. Using unrestricted Hartree-Fock theory, we evaluate both the altermagnetic and topological order parameters and show that they co-exist with an associated quantum spin Hall effect in a large region of the phase diagram, which we further support using exact diagonalization. Moreover, we demonstrate that inversion-symmetry breaking terms can also mediate second-order topological phases with associated corner modes.
