Transformer spin-triplet superconductivity at the onset of isospin order in bilayer graphene

Dong, Zhiyu; Chubukov, Andrey V.; Levitov, Leonid

doi:10.1103/physrevb.107.174512

Transformer spin-triplet superconductivity at the onset of isospin order in bilayer graphene

Journal Article · Thu May 11 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.174512· OSTI ID:2007066

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Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); University of Minnesota
University of Minnesota, Minneapolis, MN (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

We consider the origin of superconductivity found recently in Bernal bilayer graphene at the onset of isospin-polarized order, trying to infer the pairing mechanism and superconducting order from the measurements available to date. The superconductivity is induced by a parallel magnetic field and persists well above the Pauli limit, indicating an unconventional scenario of quantum-critical pairing, where soft fluctuations of isospin give rise to spin-triplet superconductivity. We consider the scenario in which the pairing interaction is entirely repulsive, which stands in contrast to the typical quantum-critical pairing mechanisms. Superconductivity emerges through a “transformer” mechanism where, in the presence of an in-plane magnetic field, the incipient valley polarization converts a frequency-independent repulsion into one with a strong nonmonotonic frequency dependence. Such an interaction enables a nonzero solution for the pairing gap function that changes sign as a function of frequency. Furthermore, the same mechanism holds at zero field in the presence of spin-orbit coupling, providing a likely explanation for the recently observed superconductivity in bilayer graphene on the WSe₂ monolayer.

View Accepted Manuscript (DOE)

Research Organization:: University of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: Army Research Office (ARO); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014402

OSTI ID:: 2007066

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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