RT Journal Article
T1 Fractional corner charges in threefold-symmetric two-dimensional materials with fragile topology
A1 Arroyo Gascón, Olga
A1 Bravo, Sergio
A1 Chico Gómez, Leonor María
A1 Pacheco, Mónica
AB 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.
PB American Physical Society
YR 2025
FD 2025-06-20
LK https://hdl.handle.net/20.500.14352/122941
UL https://hdl.handle.net/20.500.14352/122941
LA eng
NO 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.
NO Grant No. 1211913
NO Ministerio de Ciencia e Innovación (España)
NO Agencia Estatal de Investigación (España)
NO European Commission
NO Comunidad de Madrid
NO Fondo Nacional de Desarrollo Científico y Tecnológico (Chile)
DS Docta Complutense
RD 24 dic 2025