2026-06-29T07:32:15Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1229412025-07-31T00:12:37Zcom_20.500.14352_14col_20.500.14352_15

Fractional corner charges in threefold-symmetric two-dimensional materials with fragile topology Arroyo Gascón, Olga Bravo, Sergio Chico Gómez, Leonor María Pacheco, Mónica 538.9 Topological materials 2-dimensional systems Transition metal dichalcogenides Symmetries Física de materiales 2211 Física del Estado Sólido Grant No. 1211913 We perform a systematic study of the signatures of fragile topology in over 50 nonmagnetic two-dimensional materials with formula AB2, belonging to space group P3m1. Using group theory analysis in the framework of topological quantum chemistry, we find fragile bands near the Fermi level for all the materials studied. Since stable topological bands are also present in these systems, the interplay of both phases is discussed, showing that corner charges appear in over 80% of the materials and are linked to fragile topology. Using first-principles calculations, we predict fractionally charged corner charges protected by C3 symmetry. Our work aims to broaden the scope of materials with experimentally accessible fragile bands. Ministerio de Ciencia e Innovación (España) Agencia Estatal de Investigación (España) European Commission Comunidad de Madrid Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) Depto. de Física de Materiales Fac. de Ciencias Físicas TRUE pub 2025-07-30T20:13:17Z 2025-07-30T20:13:17Z 2025-06-20 journal article VoR https://hdl.handle.net/20.500.14352/122941 XXXX-XXXX 10.1103/qcr8-jxvn 2643-1564 eng info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-136285NB-C31/ES/MODELIZACION Y SIMULACION DE FENOMENOS CUANTICOS EMERGENTES EN NANOMATERIALES ROTADOS Y CON INGENIERIA DE SIMETRIAS/ (MAD2D-CM)-UCM5 info:eu-repo/grantAgreement/AEI//PRE2019-088874 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica, Técnica y de Innovación para el período 2021-2023/CNS2022-136025/ES/ Arroyo-Gascón, O., Bravo, S., Chico, L. and Pacheco, M., 2025. Fractional corner charges in threefold-symmetric two-dimensional materials with fragile topology. Physical Review Research, 7(2), p.023282. Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ open access application/pdf American Physical Society