Published January 10, 2022 | Version v1
Dataset Open

Isospin magnetism and spin-polarized superconductivity in Bernal bilayer graphene

  • 1. University of California, Santa Barbara
  • 2. University of California, Santa Barbara*
  • 3. National Institute for Materials Science**

Description

We report the observation of spin-polarized superconductivity in Bernal bilayer graphene when doped to a saddle-point van Hove singularity generated by large applied perpendicular electric field.   We observe a cascade of electrostatic gate-tuned transitions between electronic phases distinguished by their polarization within the isospin space defined by the combination of the spin and momentum-space valley degrees of freedom. While all of these phases are metallic at zero magnetic field, we observe a transition to a superconducting state at finite B|| ≈ 150mT applied parallel to the two dimensional sheet. Superconductivity occurs near a symmetry breaking transition, and exists exclusively above the B||-limit expected of a paramagnetic superconductor with the observed Tc ≈ 30mK, implying a spin-triplet order parameter. 

Notes

Please refer to the README.txt file and the associated manuscript.

Files

data.zip

Files (223.1 MB)

Name Size Download all
md5:30752969b6fc7be8119c4e126d0b13ba
223.1 MB Preview Download

Additional details

Related works

Is derived from
10.5281/zenodo.5816268 (DOI)