| Autor: |
Zhou, Haoxin, Holleis, Ludwig, Saito, Yu, Cohen, Liam, Huynh, William, Patterson, Caitlin L., Yang, Fangyuan, Taniguchi, Takashi, Watanabe, Kenji, Young, Andrea F. |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Science 375, 774 (2022) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1126/science.abm8386 |
| Popis: |
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 $B_\parallel\approx 150$mT applied parallel to the two dimensional sheet. Superconductivity occurs near a symmetry breaking transition, and exists exclusively above the $B_\parallel$-limit expected of a paramagnetic superconductor with the observed $T_C\approx 30$mK, implying a spin-triplet order parameter. |
| Databáze: |
arXiv |
| Externí odkaz: |
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