  We study the transient dynamics in a two-dimensional system of interacting
Dirac fermions subject to a quenched drive with circularly polarized light. In
the absence of interactions, the drive opens a gap at the Dirac point in the
quasienergy spectrum, inducing nontrivial band topology. Here we investigate
the dynamics of this gap opening process in the presence of interactions, as
captured by the generalized spectral function and correlators probed by
photoemission experiments. Through a mechanism akin to that known for
equilibrium systems, interactions renormalize and enhance the induced gap over
its value for the non-interacting system. We additionally study the heating
that naturally accompanies driving in the interacting system, and discuss the
regimes where dynamical gap emergence and enhancement can be probed before
heating becomes significant.
