  Recent years have seen many examples of how the strong spin-orbit coupling
(SOC) present in iridates can stabilize new emergent states that are difficult
or impossible to realize in more conventional materials. In this review we
outline a representative set of studies detailing how heterostructures based on
Ruddlesden-Popper (RP) and perovskite iridates can be used to access yet more
novel physics. Beginning with a short synopsis of iridate thin film growth, the
effects of the heterostructure morphology on the RP iridates including Sr2IrO4
and SrIrO3 are discussed. Example studies explore the effects of epitaxial
strain, laser-excitation to access transient states, topological
semimetallicity in SrIrO3, 2D magnetism in artificial RP iridates, and
interfacial magnetic coupling between iridate and neighboring layers. Taken
together, these works show the fantastic potential for controlled engineering
of novel quantum phenomena in iridate heterostructures.
