Correlation-driven 3d Heavy Fermion behavior in LiV2O4
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918138044481536 |
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| author | Lei, Min-Yi-Nan Chen, Z. H. Wang, H. T. Fan, Y. Guo, N. Jiang, T. X. Cao, Yanwei Zhang, T. Peng, Rui Xu, Haichao |
| author_facet | Lei, Min-Yi-Nan Chen, Z. H. Wang, H. T. Fan, Y. Guo, N. Jiang, T. X. Cao, Yanwei Zhang, T. Peng, Rui Xu, Haichao |
| contents | LiV2O4 is a spinel-structured compound that stands out as the first known 3d-electron system exhibiting typical heavy fermion behavior. A central question is how such strong mass renormalization emerges in the absence of f-electrons. In this work, we investigate the three-dimensional electronic structure of LiV2O4 thin films using angle-resolved photoemission spectroscopy (ARPES). We identify that an electron-like flat band is derived from a1g orbitals, along with a highly dispersive e'g band strongly coupled with phonons. The overall agreement with dynamical mean-field theory (DMFT) calculations highlights the essential role of inter-orbital Hund's coupling in reducing the a1g bandwidth to 25 meV, approaching a Mott state. Notably, we find that heavy-fermion behavior arises from additional renormalization at the a1g band near the Fermi level, likely driven by many-body interactions at energy scales down to a few meV and potentially linked to geometric frustration inherent to the spinel lattice. These results provide crucial insights into the origin of the heavy fermion behavior in 3d-electron systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_05237 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Correlation-driven 3d Heavy Fermion behavior in LiV2O4 Lei, Min-Yi-Nan Chen, Z. H. Wang, H. T. Fan, Y. Guo, N. Jiang, T. X. Cao, Yanwei Zhang, T. Peng, Rui Xu, Haichao Strongly Correlated Electrons LiV2O4 is a spinel-structured compound that stands out as the first known 3d-electron system exhibiting typical heavy fermion behavior. A central question is how such strong mass renormalization emerges in the absence of f-electrons. In this work, we investigate the three-dimensional electronic structure of LiV2O4 thin films using angle-resolved photoemission spectroscopy (ARPES). We identify that an electron-like flat band is derived from a1g orbitals, along with a highly dispersive e'g band strongly coupled with phonons. The overall agreement with dynamical mean-field theory (DMFT) calculations highlights the essential role of inter-orbital Hund's coupling in reducing the a1g bandwidth to 25 meV, approaching a Mott state. Notably, we find that heavy-fermion behavior arises from additional renormalization at the a1g band near the Fermi level, likely driven by many-body interactions at energy scales down to a few meV and potentially linked to geometric frustration inherent to the spinel lattice. These results provide crucial insights into the origin of the heavy fermion behavior in 3d-electron systems. |
| title | Correlation-driven 3d Heavy Fermion behavior in LiV2O4 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.05237 |