Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene
Gating Bernal bilayer graphene breaks the inversion symmetry so that the stacking AB/BA boundaries within the gap reveal topologically protected states. In this study, we theoretically investigate arrays where the AB and BA domains are periodically patterned with experimentally identified defect lin...
| Autores: | ; ; ; ; |
|---|---|
| Tipo de documento: | Artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/123664 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/123664 |
| Nivel de acceso: | Acceso abierto |
| Palabra clave: | 538.9 Boundaries Transport Order Física de materiales 2211 Física del Estado Sólido |
| _version_ | 1878730751695912960 |
|---|---|
| author | Guerrero-Avilés, R. |
| author2 | Ayuela, A. Chico Gómez, Leonor María Jaskólski, W. Pelc, M. |
| author2_role | author author author author |
| author_browse | Ayuela, A. Chico Gómez, Leonor María Guerrero-Avilés, R. Jaskólski, W. Pelc, M. |
| author_facet | Guerrero-Avilés, R. Ayuela, A. Chico Gómez, Leonor María Jaskólski, W. Pelc, M. |
| author_role | author |
| collection | Docta Complutense |
| description | Gating Bernal bilayer graphene breaks the inversion symmetry so that the stacking AB/BA boundaries within the gap reveal topologically protected states. In this study, we theoretically investigate arrays where the AB and BA domains are periodically patterned with experimentally identified defect lines. In the calculations we consider electron-electron interaction effects using density functional theory. Our findings reveal the existence of topological states within a gap induced by the patterning without an applied gate voltage. Furthermore, with an applied gate potential, the defect lines introduce spin-polarized states pinned within the gap and exhibit ferromagnetically coupled states. Importantly, we observe a hybridization of magnetic and topological states near the valleys that form conducting channels characterized by spin-momentum locking. The effect persists even with slight n-doping and gate voltage; however, the progressively pinned n-doped defect states induce spin polarization in the topological and valley states. Additionally, the two-dimensional bands under doping conditions exhibit nesting across the Fermi surface, allowing for modulation of charge densities along the lines which are nearly commensurate with the underlying graphene-defect lines. These quasi-one-dimensional patterns in bilayer graphene show a new kind of spin-conducting channels with novel characteristics common to both spintronics and valleytronics. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_22abf32073232e0108cbc0c3caa7cb39 |
| institution | Universidad Complutense de Madrid (UCM) |
| instname_str | Universidad Complutense de Madrid (UCM) |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:docta.ucm.es:20.500.14352/123664 |
| publishDate | 2025 |
| publishDateSort | 2025 |
| publisher | Nature |
| publisherStr | Nature |
| reponame_str | Docta Complutense |
| spelling | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene Guerrero-Avilés, R. Ayuela, A. Chico Gómez, Leonor María Jaskólski, W. Pelc, M. 538.9 Boundaries Transport Order Física de materiales 2211 Física del Estado Sólido Gating Bernal bilayer graphene breaks the inversion symmetry so that the stacking AB/BA boundaries within the gap reveal topologically protected states. In this study, we theoretically investigate arrays where the AB and BA domains are periodically patterned with experimentally identified defect lines. In the calculations we consider electron-electron interaction effects using density functional theory. Our findings reveal the existence of topological states within a gap induced by the patterning without an applied gate voltage. Furthermore, with an applied gate potential, the defect lines introduce spin-polarized states pinned within the gap and exhibit ferromagnetically coupled states. Importantly, we observe a hybridization of magnetic and topological states near the valleys that form conducting channels characterized by spin-momentum locking. The effect persists even with slight n-doping and gate voltage; however, the progressively pinned n-doped defect states induce spin polarization in the topological and valley states. Additionally, the two-dimensional bands under doping conditions exhibit nesting across the Fermi surface, allowing for modulation of charge densities along the lines which are nearly commensurate with the underlying graphene-defect lines. These quasi-one-dimensional patterns in bilayer graphene show a new kind of spin-conducting channels with novel characteristics common to both spintronics and valleytronics. Nature https://hdl.handle.net/20.500.14352/123664 |
| spellingShingle | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene Guerrero-Avilés, R. 538.9 Boundaries Transport Order Física de materiales 2211 Física del Estado Sólido |
| title | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene |
| title_full | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene |
| title_fullStr | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene |
| title_full_unstemmed | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene |
| title_short | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene |
| title_sort | Momentum-locked spin between topological and defect states in 1D patterns on bilayer graphene |
| topic | 538.9 Boundaries Transport Order Física de materiales 2211 Física del Estado Sólido |
| topic_facet | 538.9 Boundaries Transport Order Física de materiales 2211 Física del Estado Sólido |
| url | https://hdl.handle.net/20.500.14352/123664 |