Frustration-enhanced persistent currents in correlated trimer nanorings
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908518972391424 |
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| author | Fang, Tie-Feng Lu, Wei-Tao Guo, Ai-Min Sun, Qing-Feng |
| author_facet | Fang, Tie-Feng Lu, Wei-Tao Guo, Ai-Min Sun, Qing-Feng |
| contents | We investigate the persistent current in a correlated trimer nanoring comprising of three magnetic atoms, which sits on a metallic host and encloses a magnetic flux. In the molecular-orbital regime, charge fluctuations can reverse the aromaticity of the trimer molecule by driving quantum phase transitions between many-body states. It is shown that in frustrated trimers the superexchange-induced current as a function of interatom hopping is enhanced by the competition of conflicting magnetic orders, with an asymmetric peak at the quantum criticality separating the ferromagnetic and antiferromagnetic Kondo regimes. Interestingly, the critical current undergoes an anomalous rise with temperature before decaying, signaling the suppression of Kondo bound state at finite temperature. Our results demonstrate that the coherent current response to external flux indeed conveys important information on the states of strongly correlated systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03924 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Frustration-enhanced persistent currents in correlated trimer nanorings Fang, Tie-Feng Lu, Wei-Tao Guo, Ai-Min Sun, Qing-Feng Strongly Correlated Electrons We investigate the persistent current in a correlated trimer nanoring comprising of three magnetic atoms, which sits on a metallic host and encloses a magnetic flux. In the molecular-orbital regime, charge fluctuations can reverse the aromaticity of the trimer molecule by driving quantum phase transitions between many-body states. It is shown that in frustrated trimers the superexchange-induced current as a function of interatom hopping is enhanced by the competition of conflicting magnetic orders, with an asymmetric peak at the quantum criticality separating the ferromagnetic and antiferromagnetic Kondo regimes. Interestingly, the critical current undergoes an anomalous rise with temperature before decaying, signaling the suppression of Kondo bound state at finite temperature. Our results demonstrate that the coherent current response to external flux indeed conveys important information on the states of strongly correlated systems. |
| title | Frustration-enhanced persistent currents in correlated trimer nanorings |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.03924 |