Vestigial singlet pairing in a fluctuating magnetic triplet superconductor: Applications to graphene moiré systems
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2023
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| _version_ | 1866929255294697472 |
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| author | Poduval, Prathyush P. Scheurer, Mathias S. |
| author_facet | Poduval, Prathyush P. Scheurer, Mathias S. |
| contents | Motivated by the phenomenology of graphene moiré superlattices, we study a 2D model with strong tendencies towards both magnetism and triplet superconductivity. Individually, their respective order parameters, $\vec{N}$ and $\vec{d}$, cannot order at finite temperature. Nonetheless, the model exhibits a variety of vestigial phases, including charge-$4e$ superconductivity and broken time-reversal symmetry. Our main focus is on a phase characterized by finite $\vec{d} \cdot \vec{N}$, which has the same symmetries as the BCS state, a Meissner effect, and metastable supercurrents, yet rather different spectral properties: most notably, the suppression of the electronic density of states at the Fermi can resemble that of either a fully gapped or nodal superconductor, depending on parameters. This could provide a possible explanation for recent tunneling experiments in graphene moiré systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_01344 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Vestigial singlet pairing in a fluctuating magnetic triplet superconductor: Applications to graphene moiré systems Poduval, Prathyush P. Scheurer, Mathias S. Superconductivity Motivated by the phenomenology of graphene moiré superlattices, we study a 2D model with strong tendencies towards both magnetism and triplet superconductivity. Individually, their respective order parameters, $\vec{N}$ and $\vec{d}$, cannot order at finite temperature. Nonetheless, the model exhibits a variety of vestigial phases, including charge-$4e$ superconductivity and broken time-reversal symmetry. Our main focus is on a phase characterized by finite $\vec{d} \cdot \vec{N}$, which has the same symmetries as the BCS state, a Meissner effect, and metastable supercurrents, yet rather different spectral properties: most notably, the suppression of the electronic density of states at the Fermi can resemble that of either a fully gapped or nodal superconductor, depending on parameters. This could provide a possible explanation for recent tunneling experiments in graphene moiré systems. |
| title | Vestigial singlet pairing in a fluctuating magnetic triplet superconductor: Applications to graphene moiré systems |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2301.01344 |