Events

Past Event

Pro QM Seminar: "Ultranodal state in multiband spin-1/2 superconductors" with Dr. Peter Hirschfeld

Dr. Peter Hirschfeld
November 1, 2023
3:30 PM - 4:30 PM
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Theory Center

"Ultranodal state in multiband spin-1/2 superconductors"

Recent measurements on the tetragonal phase of FeSe,S support the existence of a remarkable phase where the superconducting state supports a finite residual density of states arising from patchlike nodal surfaces. This ``ultranodal" state can arise in situations where conventional intraband spin singlet pairing is highly anisotropic and coexists with time-reversal symmetry breaking interband spin triplet interactions. Here I present a microscopic scenario including ferromagnetic interactions that can account for nonunitary pairing and C4 symmetry breaking in the superconducting state that is also observed in recent experiments.