Work

Geometric bulk-edge correspondence for $\mathbb{Z}_2$-topological insulators

Year: 2026

Type: preprint

Abstract: Fermionic time-reversal-invariant insulators in two dimensions--class AII in the Kitaev table--come in two topological phases. These phases are characterized by a $\mathbb{Z}_2$-valued invariant, the Fu-Kane-Mele index. We prove a geometric bulk-edge correspondence for curved interfaces: if two such insulators occupy complementary regions separated by a curved boundary, then the $\mathbb{Z}_2$ edge index of the interface system is the product, modulo two, of the difference of the two bulk $\mathbb{Z}_2$ indices and a geometric intersection number associated with the boundary and the measurement region. The argument is a $\mathbb{Z}_2$ analogue of the curved-interface connection formula proved for Hall insulators in \cite{DZ24}.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2606.27318

Authors: Drouot, Alexis, Shapiro, Jacob, Zhu, Xiaowen

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Division of Mathematical Sciences

Awards: Waves and Topology in Quantum Materials, CAREER: Mathematical Aspects of Topological Phases, G5928049936, G6671297155, Classification of Topological Insulators

OpenAlex ID: W7166163391

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