| Texto completo | |
| Autor(es): |
Sandoval, M. A. Toloza
;
Freire, R. L. H.
;
Araujo, A. L.
;
Acosta, Carlos Mera
;
de Lima, F. Crasto
;
Fazzio, A.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW MATERIALS; v. 9, n. 9, p. 6-pg., 2025-09-02. |
| Resumo | |
Topological insulators are expected to exhibit robust edge-state transport protected by time-reversal symmetry, yet experimental conductance often falls below the quantized limit due to intrinsic and interfacial effects. Here, we demonstrate that the orbital character of topological edge states, governed by spin-orbit coupling and edge termination, plays a critical role in electron injection and transport. Using first-principles calculations combined with nonequilibrium Green's function methods, we investigate PbSe nanoribbons as a model system. We identify an orbital filtering mechanism arising from spin-orbital-entangled edge states, where the j = 1/2 and j = 3/2 components of the p orbitals obey symmetry-imposed selection rules at the interface. This effect limits conductance even in the absence of disorder; when present, disorder further promotes an interplay between topological edge states and resonant edge-localized states originating from dangling bonds. Our findings highlight the importance of orbital engineering and angular momentum symmetry mismatch in the design of topological devices and call for an examination of interface physics in quantum materials regarding the topological protection. (AU) | |
| Processo FAPESP: | 24/00989-7 - Centro de Pesquisa em Engenharia Molecular para Materiais Avançados (CEMol) |
| Beneficiário: | Edson Roberto Leite |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 23/09820-2 - Design de materiais: dos materiais quânticos às aplicações em energia. |
| Beneficiário: | Gustavo Martini Dalpian |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 23/12336-5 - Defeitos Nativos e amorfos controlando propriedades em materiais 2D |
| Beneficiário: | Augusto de Lelis Araújo |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |