Superconductivity in kagome metals due to soft loop-current fluctuations
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866910243662856192 |
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| author | Schultz, Daniel J. Palle, Grgur Mitra, Asimpunya Kim, Yong Baek Fernandes, Rafael M. Schmalian, Jörg |
| author_facet | Schultz, Daniel J. Palle, Grgur Mitra, Asimpunya Kim, Yong Baek Fernandes, Rafael M. Schmalian, Jörg |
| contents | We demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral $d+id$ superconductivity, which spontaneously breaks time-reversal symmetry, the inclusion of antimony orbitals stabilizes an $s^{\pm}$ state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_16892 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superconductivity in kagome metals due to soft loop-current fluctuations Schultz, Daniel J. Palle, Grgur Mitra, Asimpunya Kim, Yong Baek Fernandes, Rafael M. Schmalian, Jörg Superconductivity Strongly Correlated Electrons We demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral $d+id$ superconductivity, which spontaneously breaks time-reversal symmetry, the inclusion of antimony orbitals stabilizes an $s^{\pm}$ state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition. |
| title | Superconductivity in kagome metals due to soft loop-current fluctuations |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.16892 |