"Gap symmetry and Nodal structure of iron-based superconductors":
I focus on the paring symmetry in the class of the iron based superconductors with only electron pockets.
According to ARPES and neutron scattering the pairing is neither a d-nor a regular s-wave.
Instead a third possibility exists reconciling different observations.
In the theoretical model I’ll introduce the special kind of s+- order driven by inter-pocket hybridization.
The competition between the pocket geometry and hybridization is studied within the Ginzburg-Landau phenomenology and gives rise to a rich phase diagram including the s+id phase with broken time reversal symmetry.
Next, I explain why the proposed scenario is consistent with neutron scattering results.
Finally I compare the predicted Raman peak due to Bardasis-Schrieffer modes with recently observed in-gap excitations in Bg geometry.