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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.19474 |
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| _version_ | 1866914079299338240 |
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| author | Parra-Martinez, Guillermo Jimeno-Pozo, Alejandro Phong, Vo Tien Sainz-Cruz, Hector Kaplan, Daniel Emanuel, Peleg Oreg, Yuval Pantaleon, Pierre A. Silva-Guillen, Jose Angel Guinea, Francisco |
| author_facet | Parra-Martinez, Guillermo Jimeno-Pozo, Alejandro Phong, Vo Tien Sainz-Cruz, Hector Kaplan, Daniel Emanuel, Peleg Oreg, Yuval Pantaleon, Pierre A. Silva-Guillen, Jose Angel Guinea, Francisco |
| contents | Recently, exotic superconductivity emerging from a spin-and-valley-polarized metallic phase has been discovered in rhombohedral tetralayer graphene. To explain this observation, we study the role of electron-electron interactions in driving flavor symmetry breaking, using the Hartree-Fock (HF) approximation, and in stabilizing superconductivity mediated by repulsive interactions. Though mean-field HF correctly predicts the isospin flavors and reproduces the experimental phase diagram, it overestimates the band renormalization near the Fermi energy and suppresses superconducting instabilities. To address this, we introduce a physically motivated scheme that includes internal screening in the HF calculation. Using this formalism, we find superconductivity arising from the spin-valley polarized phase for a range of electric fields and electron dopings. Our findings reproduce the experimental observations and reveal a p-wave, finite-momentum, time-reversal-symmetry-broken superconducting state, encouraging further investigation into exotic phases in graphene multilayers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_19474 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Band Renormalization, Quarter Metals, and Chiral Superconductivity in Rhombohedral Tetralayer Graphene Parra-Martinez, Guillermo Jimeno-Pozo, Alejandro Phong, Vo Tien Sainz-Cruz, Hector Kaplan, Daniel Emanuel, Peleg Oreg, Yuval Pantaleon, Pierre A. Silva-Guillen, Jose Angel Guinea, Francisco Strongly Correlated Electrons Recently, exotic superconductivity emerging from a spin-and-valley-polarized metallic phase has been discovered in rhombohedral tetralayer graphene. To explain this observation, we study the role of electron-electron interactions in driving flavor symmetry breaking, using the Hartree-Fock (HF) approximation, and in stabilizing superconductivity mediated by repulsive interactions. Though mean-field HF correctly predicts the isospin flavors and reproduces the experimental phase diagram, it overestimates the band renormalization near the Fermi energy and suppresses superconducting instabilities. To address this, we introduce a physically motivated scheme that includes internal screening in the HF calculation. Using this formalism, we find superconductivity arising from the spin-valley polarized phase for a range of electric fields and electron dopings. Our findings reproduce the experimental observations and reveal a p-wave, finite-momentum, time-reversal-symmetry-broken superconducting state, encouraging further investigation into exotic phases in graphene multilayers. |
| title | Band Renormalization, Quarter Metals, and Chiral Superconductivity in Rhombohedral Tetralayer Graphene |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.19474 |