2026-11-09 理化学研究所
図1 本研究の手法の概念図
＜関連情報＞
- https://www.riken.jp/press/2026/20261109_1/index.html
- https://journals.aps.org/prx/abstract/10.1103/2rw7-bzl4
トポロジカル絶縁体および超伝導体の完全な特性評価に向けて：アティヤ・ヒルツェブルフスペクトル系列に基づくトポロジカル不変量の体系的な構築 Toward Complete Characterization of Topological Insulators and Superconductors: A Systematic Construction of Topological Invariants Based on Atiyah-Hirzebruch Spectral Sequence
Seishiro Ono and Ken Shiozaki
Physical Review X Published: 23 October, 2026
DOI:https://doi.org/10.1103/2rw7-bzl4
Abstract
The past decade has witnessed significant progress in topological materials investigation. Symmetry-indicator theory and topological quantum chemistry provide an efficient scheme to diagnose topological phases from only partial information of wave functions without full knowledge of topological invariants, which has resulted in a recent comprehensive materials search. However, not all topological phases can be captured by this framework, and topological invariants are needed for a more refined diagnosis of topological phases. In this study, we present a systematic framework to construct topological invariants for a large part of symmetry classes, which should be contrasted with the existing invariants discovered through one-by-one approaches. Our method is based on the recently developed Atiyah-Hirzebruch spectral sequence in momentum space. As a demonstration, we construct topological invariants for time-reversal-symmetric spinful superconductors with conventional pairing symmetries of all space groups, for which symmetry indicators are silent. We also validate that the obtained quantities work as topological invariants by computing them for randomly generated symmetric Hamiltonians. Remarkably, the constructed topological invariants completely characterize groups in 159 space groups. Our topological invariants for normal conducting phases are defined under some gauge conditions. To facilitate efficient numerical simulations, we discuss how to derive gauge-independent topological invariants from the gauge-fixed topological invariants through some examples. Combined with first-principles calculations, our results will help us discover topological materials that could be used in next-generation devices and pave the way for a more comprehensive topological materials database.
