  We explore ways in which the close proximity between graphene sheets and
monolayers of 2D superconductors can lead to hybridization between their
collective excitations. We consider heterostructures formed by combinations of
graphene sheets and 2D superconductor monolayers. The broad range of energies
in which the graphene plasmon can exist, together with its tunability, makes
such heterostrucutres promising platforms for probing the many-body physics of
superconductors. We show that the hybridization between the graphene plasmon
and the Bardasis-Schrieffer mode of a 2D superconductor results in clear
signatures on the near-field reflection coefficient of the heterostructure,
which in principle can be observed in scanning near-field microscopy
experiments.
