Isospin magnetism and spin-polarized superconductivity in Bernal bilayer graphene
Creators
- 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.
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Additional details
Related works
- Is derived from
- 10.5281/zenodo.5816268 (DOI)