Superconductivity in Twisted Bilayer Graphene
ABSTRACT :
Graphene, a layer of honeycomb lattice of carbon atoms is a semimetal. It doesn't superconduct even at the lowest temperatures. A bilayer graphene, with perfect atomic registry (called AA stacking), is also not a superconductor. However, a small twist of about 1.1 degree and resulting Moiŕe super lattice, pushes bilayer graphene to the verge of superconductivity, as shown by recent experiments [1]. That is, a small gate voltage produces superconductivity with a Tc ~ 1.7 K. I will describe a theory [2] of this exciting example of emergence - the whole is more than the sum of its parts. [1] Y. Cao et al., Magic-angle graphene superlattices: a new platform for unconventional superconductivity, arXiv:1803:02342 (to appear in Nature) [2] G. Baskaran, Theory of Emergent Josephson Lattice in Neutral Twisted Bilayer Graphene (Moiŕe is Different), arXiv:1804.00627