Special Quantum Matter Seminar

The electronic band structure of rhombohedral graphene multilayers hosts van Hove singularities at which the single particle of states diverges. I will discuss experiments in which we use electrostatic gates to tune the chemical potential through these singularities, revealing a cascade of correlated electron phases; notably, both singlet and triplet superconductors are observed proximal to or within generalized ferromagnetic phases where the system spontaneously polarizes into one or more of the spin- and valley isospin flavors. I will give an overview of this system, and describe recent experiments that reveal the role of intrinsic spin orbit coupling in graphene and the presence of spin and valley fluctuations at high temperatures.