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

ABSTRACT: 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 su

SUBMITTER: Poduval PP 

PROVIDER: S-EPMC10894192 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature