Unconventional superconductivity in magic-angle graphene superlattices
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.