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arXiv 2005.03679cond-mat.supr-con
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时间反演不变的$C_2$对称高阶拓扑超导体

Time-reversal-invariant $C_2$-symmetric higher-order topological superconductors

DinhDuy Vu, Rui-Xing Zhang, Sankar Das Sarma

摘要:

提出了一个二维DIII类超导体的最小晶格模型,该模型具有$C_2$保护的高阶拓扑结构。虽然这类超导体不能在高对称动量的对称特征值的拓扑特征,我们提出了一个简单的Wannier轨道为基础的实空间诊断,明确地捕获相应的高阶拓扑结构。在我们的极小模型中,我们进一步识别和表征了各种传统的拓扑相,包括弱拓扑超导体和具有手征对称保护的节点拓扑超导体。无序效应也被系统地研究,以证明高阶体边界对应的鲁棒性。我们的理论为预测和诊断$C_2$保护的DIII类超导体高阶拓扑奠定了基础。

英文摘要:

We propose a minimal lattice model for two-dimensional class DIII superconductors with $C_2$-protected higher-order topology. While this class of superconductors cannot be topologically characterized by symmetry eigenvalues at high symmetry momenta, we propose a simple Wannier-orbital-based real-space diagnosis to unambiguously capture the corresponding higher-order topology. We further identify and characterize a variety of conventional topological phases in our minimal model, including a weak topological superconductor and a nodal topological superconductor with chiral-symmetry protection. The disorder effect is also systematically studied to demonstrate the robustness of higher-order bulk-boundary correspondence. Our theory lays the groundwork for predicting and diagnosing $C_2$-protected higher-order topology in class DIII superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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