Competing zero-field Chern insulators in Superconducting Twisted Bilayer Graphene

Understand

The discovery of magic angle twisted bilayer graphene (MATBG) has unveiled a rich variety of superconducting, magnetic and topologically nontrivial phases.

• The existence of all these phases in one material, and their tunability, has opened new pathways for the creation of unusual gate tunable junctions.
• However, the required conditions for their creation - gate induced transitions between phases in zero magnetic field - have so far not been achieved.
• Here, we report on the first experimental demonstration of a device that is both a zero-field Chern insulator and a superconductor.