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Nematicity in FeSe, why and so what?

Despite its seemingly simple composition and structure, the pairing mechanism of FeSe remains an open problem that is drawing attention due to several striking phenomena. In addition to the highest critical temperature reached in the single layer FeSe, nematic order without magnetic order in this compound singles it out from the family of Fe-based superconductors. Guided by unusual inelastic neutron spectra with a broad continuum, I will propose a strong coupling mechanism for the nematic quantum paramagnet phenomena. Furthermore, I will discuss the implication of resulting nematic d ± s -wave superconductivity in supporting emergent p-wave superconducting state at the twin boundary.