Ultra-long-range spin coupling in graphene revealed by atomically resolved spin excitations
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
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| _version_ | 1866912698269171712 |
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| author | Viña-Bausá, Beatriz Costa, Antonio. T. Henriques, Joao Río, Eva Cortés-del Carrasco, Roberto Mallet, Pierre Veuillen, Jean-Yves Fernández-Rossier, Joaquín Brihuega, Iván |
| author_facet | Viña-Bausá, Beatriz Costa, Antonio. T. Henriques, Joao Río, Eva Cortés-del Carrasco, Roberto Mallet, Pierre Veuillen, Jean-Yves Fernández-Rossier, Joaquín Brihuega, Iván |
| contents | Magnetic interactions between localized spins-1/2 play a central role in quantum magnetism, spin-based quantum computing, and quantum simulation. The range and strength of these interactions are key figures of merit. Here, we probe exchange interactions in pairs and trimers of spins-1/2 introduced by chemisorption of individual hydrogen atoms on graphene. Using scanning tunneling microscopy and inelastic electron tunneling spectroscopy, supported by large-scale mean-field Hubbard calculations, we demonstrate 3 meV exchange couplings at separations beyond 10 nm, surpassing all prior systems. The couplings can be ferro- or antiferromagnetic depending on the relative sublattice arrangement. Real-space mapping of spin excitation amplitudes enables characterization with atomic-resolution. Through atomic manipulation we extend this control to spin trimers, revealing collective spin excitations when pairwise exchange couplings are comparable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06887 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultra-long-range spin coupling in graphene revealed by atomically resolved spin excitations Viña-Bausá, Beatriz Costa, Antonio. T. Henriques, Joao Río, Eva Cortés-del Carrasco, Roberto Mallet, Pierre Veuillen, Jean-Yves Fernández-Rossier, Joaquín Brihuega, Iván Mesoscale and Nanoscale Physics Materials Science Magnetic interactions between localized spins-1/2 play a central role in quantum magnetism, spin-based quantum computing, and quantum simulation. The range and strength of these interactions are key figures of merit. Here, we probe exchange interactions in pairs and trimers of spins-1/2 introduced by chemisorption of individual hydrogen atoms on graphene. Using scanning tunneling microscopy and inelastic electron tunneling spectroscopy, supported by large-scale mean-field Hubbard calculations, we demonstrate 3 meV exchange couplings at separations beyond 10 nm, surpassing all prior systems. The couplings can be ferro- or antiferromagnetic depending on the relative sublattice arrangement. Real-space mapping of spin excitation amplitudes enables characterization with atomic-resolution. Through atomic manipulation we extend this control to spin trimers, revealing collective spin excitations when pairwise exchange couplings are comparable. |
| title | Ultra-long-range spin coupling in graphene revealed by atomically resolved spin excitations |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2511.06887 |