Heisenberg Spin-1/2 Antiferromagnetic Molecular Chains
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866916309520875520 |
|---|---|
| author | Sun, Kewei Cao, Nan Silveira, Orlando J. Fumega, Adolfo O. Hanindita, Fiona Ito, Shingo Lado, Jose L. Liljeroth, Peter Foster, Adam S. Kawai, Shigeki |
| author_facet | Sun, Kewei Cao, Nan Silveira, Orlando J. Fumega, Adolfo O. Hanindita, Fiona Ito, Shingo Lado, Jose L. Liljeroth, Peter Foster, Adam S. Kawai, Shigeki |
| contents | Carbon-based nanostructures possessing π-electron magnetism have attracted tremendous interest due to their great potential for nano spintronics. In particular, quantum chains with magnetic molecular units synthesized by on-surface reactions provide an ideal playground for investigating magnetic exchange interactions between localized spin components. Here, we present an extensive study of antiferromagnetic nanographene chains with the diazahexabenzocoronene molecule as the repeating unit. A combination of bond-resolved scanning tunneling microscopy, density functional theory and quantum spin models revealed their detailed structures and electronic and magnetic properties. We found that the antiferromagnetic chains host a collective state featuring gapped excitations for an even number of repeating units and one featuring a Kondo excitation for an odd number. Comparing with exact many-body quantum spin models, our molecular chains provide the realization of an entangled quantum Heisenberg model. Coupled with the tunability of the molecular building blocks, these systems can act as an ideal platform for the experimental realization of topological spin lattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_02142 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Heisenberg Spin-1/2 Antiferromagnetic Molecular Chains Sun, Kewei Cao, Nan Silveira, Orlando J. Fumega, Adolfo O. Hanindita, Fiona Ito, Shingo Lado, Jose L. Liljeroth, Peter Foster, Adam S. Kawai, Shigeki Mesoscale and Nanoscale Physics Chemical Physics Carbon-based nanostructures possessing π-electron magnetism have attracted tremendous interest due to their great potential for nano spintronics. In particular, quantum chains with magnetic molecular units synthesized by on-surface reactions provide an ideal playground for investigating magnetic exchange interactions between localized spin components. Here, we present an extensive study of antiferromagnetic nanographene chains with the diazahexabenzocoronene molecule as the repeating unit. A combination of bond-resolved scanning tunneling microscopy, density functional theory and quantum spin models revealed their detailed structures and electronic and magnetic properties. We found that the antiferromagnetic chains host a collective state featuring gapped excitations for an even number of repeating units and one featuring a Kondo excitation for an odd number. Comparing with exact many-body quantum spin models, our molecular chains provide the realization of an entangled quantum Heisenberg model. Coupled with the tunability of the molecular building blocks, these systems can act as an ideal platform for the experimental realization of topological spin lattices. |
| title | Heisenberg Spin-1/2 Antiferromagnetic Molecular Chains |
| topic | Mesoscale and Nanoscale Physics Chemical Physics |
| url | https://arxiv.org/abs/2407.02142 |