Location and thermal evolution of the pseudogap due to spin fluctuations

Ye, Mengxing; Wang, Zhentao; Fernandes, Rafael M.; Chubukov, Andrey V.

doi:10.1103/physrevb.108.115156

Cited by 2 publications

(1 citation statement)

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“…4 a. The fact that there is still a peak in the spectral function at ω = 0 for finite but sufficiently small coupling strength is in line with previous works on related one-loop self-energy diagrams 56 . In contrast, for large energies, Σ 3 is readily seen to tend to zero.…”

Section: Resultssupporting

confidence: 90%

Vestigial singlet pairing in a fluctuating magnetic triplet superconductor and its implications for graphene superlattices

Poduval,

Scheurer

2024

Nat Commun

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Stacking and twisting graphene layers allows to create and control a two-dimensional electron liquid with strong correlations. Experiments indicate that these systems exhibit strong tendencies towards both magnetism and triplet superconductivity. Motivated by this phenomenology, we study a 2D model of fluctuating triplet pairing and spin magnetism. Individually, their respective order parameters, d and N, 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 d ⋅ 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 level can resemble that of either a fully gapped or nodal superconductor, depending on parameters. This provides a possible explanation for recent tunneling experiments in the superconducting phase of graphene moiré systems.

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Section: Resultssupporting

confidence: 90%