Multilayer graphenes as a platform for interaction-driven physics and topological superconductivity

Abstract

Multilayer graphene systems without a moir\'e superlattice have emerged as an alternative platform to study interaction and superconducting phases. This study systematically compares density of states of multilayer graphene with different stacking. It identifies tetralayer graphene with rhombohedral (ABCA) stacking as the most promising material for realization of broken-symmetry phases. In-depth analysis of the phase diagram of ABCA graphene shows that, for the accessible range of experimental parameters, the material supports corrugated Fermi surface, which can realize a topological $p$+i$p$ superconducting state with chiral Majorana edge modes.

Topics & Concepts