  The pairing mechanism in different classes of correlated materials, including
iron based superconductors, is still under debate. For FeSe monolayers, uniform
nematic fluctuations have been shown in a lattice Monte Carlo study to play a
potentially important role. Here, using dynamical mean field theory
calculations for the same model system, we obtain a similar phase diagram and
provide an alternative interpretation of the superconductivity in terms of
local orbital fluctuations and phase rigidity. Our study clarifies the relation
between the superconducting order parameter, superfluid stiffness and orbital
fluctuations, and provides a link between the spin/orbital freezing theory of
unconventional superconductivity and theoretical works considering the role of
nematic fluctuations.
