Unconventional superconductivity in magic-angle graphene superlattices
Yuan Cao, Valla Fatemi, Shiang Fang, Kenji Watanabe, Takashi Taniguchi, Efthimios Kaxiras, Pablo Jarillo-Herrero
Summary
The authors stacked two graphene sheets twisted by a 'magic' angle of about 1.1 degrees, producing flat electronic bands in the resulting moire superlattice. Upon electrostatically doping near half-filling of these flat bands, they observed superconductivity with critical temperatures up to about 1.7 K. The behaviour resembles that of unconventional, strongly correlated superconductors such as the cuprates, demonstrating a tunable platform for studying correlated electron physics.
Key findings
- Superconductivity emerges in twisted bilayer graphene at the magic angle (~1.1 degrees) with Tc up to ~1.7 K.
- Superconducting domes appear upon doping away from the correlated insulator state, echoing cuprate phase diagrams.
- Establishes twisted bilayer graphene as a highly tunable platform for unconventional superconductivity.
Subjects & keywords
Cite this paper
Yuan Cao, Valla Fatemi, Shiang Fang, Kenji Watanabe, Takashi Taniguchi, Efthimios Kaxiras, & Pablo Jarillo-Herrero (2018). Unconventional superconductivity in magic-angle graphene superlattices. Nature. https://doi.org/10.1038/nature26160
@article{cao2018unconventional,
author = {Yuan Cao and Valla Fatemi and Shiang Fang and Kenji Watanabe and Takashi Taniguchi and Efthimios Kaxiras and Pablo Jarillo-Herrero},
title = {Unconventional superconductivity in magic-angle graphene superlattices},
journal = {Nature},
year = {2018},
doi = {10.1038/nature26160},
url = {https://doi.org/10.1038/nature26160}
}