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In recent years, fragile topology has emerged as one of the latest additions to the topological materials scenario. This new topological phase is studied in two-dimensional Dirac and non-Dirac materials, with an emphasis on transition metal dichalcogenides. To this end, Topological Quantum Chemistry analyses are performed, and symmetry-based topological invariants are computed for over 50 two-dimensional materials. The presence of fractionally-charged topological corner states is predicted and verified via simulations of different flake geometries with threefold rotational symmetry

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Fragile Topology in Threefold-Symmetric Systems

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  • 发表日期：

    2026年

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  • Olga Arroyo Gascón

摘要

In recent years, fragile topology has emerged as one of the latest additions to the topological materials scenario. This new topological phase is studied in two-dimensional Dirac and non-Dirac materials, with an emphasis on transition metal dichalcogenides. To this end, Topological Quantum Chemistry analyses are performed, and symmetry-based topological invariants are computed for over 50 two-dimensional materials. The presence of fractionally-charged topological corner states is predicted and verified via simulations of different flake geometries with threefold rotational symmetry