Superconductivity and correlated phases in non-twisted bilayer and trilayer graphene

Pierre A. Pantaleon, Alejandro Jimeno-Pozo, Hector Sainz-Cruz, Vo Tien Phong, Tommaso Cea, Francisco Guinea

Twisted bilayer graphene has a rich phase diagram, including superconductivity. Recently, an unexpected discovery has been the observation of superconductivity in non-twisted graphene bilayers and trilayers. In this Perspective, we give an overview of the search for uncommon phases in non-twisted graphene systems. We first contextualise these recent results within earlier work in the field, before examining the new experimental findings. Finally, we analyse the numerous theoretical models which study the underlying physical processes in these systems.