Rotational Phonons Drive Low-Energy Kinks in Cuprate Superconductors
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arXiv
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866908851942457344 |
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| author | Wang, Yanyong Engel, Manuel Lane, Christopher Miranda, Henrique Hou, Lin Barbiellini, Bernardo Ruzsinszky, Adrienn Perdew, John P. Markiewicz, Robert S. Bansil, Arun Sun, Jianwei Zhang, Ruiqi |
| author_facet | Wang, Yanyong Engel, Manuel Lane, Christopher Miranda, Henrique Hou, Lin Barbiellini, Bernardo Ruzsinszky, Adrienn Perdew, John P. Markiewicz, Robert S. Bansil, Arun Sun, Jianwei Zhang, Ruiqi |
| contents | Angle-resolved photoemission spectroscopy (ARPES) reveals ubiquitous quasiparticle ``kinks'' near $\sim$70 meV and $\sim$40 meV across cuprate superconductors, often accompanied by peak--dip--hump (PDH) structures. These features point to strong coupling between electrons and low-energy bosonic excitations, but the microscopic origin has remained elusive due to the limitations of conventional density-functional theory (DFT) and the high cost of beyond-DFT methods. Here, we systematically study the electron--phonon coupling (EPC) in hole-doped infinite-layer CaCuO$_2$ using the Strongly Constrained and Appropriately Normed (SCAN) density functional, explicitly including magnetic effects. We find a substantial EPC strength $λ$ of $\sim$0.5 in the magnetic phase, producing kinks and PDH structures in the 40-80~meV window in excellent agreement with experiments. The dominant contribution arises from rotational oxygen phonons, while breathing modes contribute little. Our results establish strong EPC in cuprates, highlight the key role of rotational phonons, and provide a framework for understanding spectral anomalies in cuprates and beyond. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_21438 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Rotational Phonons Drive Low-Energy Kinks in Cuprate Superconductors Wang, Yanyong Engel, Manuel Lane, Christopher Miranda, Henrique Hou, Lin Barbiellini, Bernardo Ruzsinszky, Adrienn Perdew, John P. Markiewicz, Robert S. Bansil, Arun Sun, Jianwei Zhang, Ruiqi Strongly Correlated Electrons Angle-resolved photoemission spectroscopy (ARPES) reveals ubiquitous quasiparticle ``kinks'' near $\sim$70 meV and $\sim$40 meV across cuprate superconductors, often accompanied by peak--dip--hump (PDH) structures. These features point to strong coupling between electrons and low-energy bosonic excitations, but the microscopic origin has remained elusive due to the limitations of conventional density-functional theory (DFT) and the high cost of beyond-DFT methods. Here, we systematically study the electron--phonon coupling (EPC) in hole-doped infinite-layer CaCuO$_2$ using the Strongly Constrained and Appropriately Normed (SCAN) density functional, explicitly including magnetic effects. We find a substantial EPC strength $λ$ of $\sim$0.5 in the magnetic phase, producing kinks and PDH structures in the 40-80~meV window in excellent agreement with experiments. The dominant contribution arises from rotational oxygen phonons, while breathing modes contribute little. Our results establish strong EPC in cuprates, highlight the key role of rotational phonons, and provide a framework for understanding spectral anomalies in cuprates and beyond. |
| title | Rotational Phonons Drive Low-Energy Kinks in Cuprate Superconductors |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.21438 |