Nonthermal superconductivity in photodoped multiorbital Hubbard systems

Abstract - Superconductivity in laser-excited correlated electron systems has attracted considerable interest due to reports of light-induced superconductinglike states. Here we explore the possibility of nonthermal superconducting order in strongly interacting multiorbital Hubbard systems, using nonequilibrium dynamical mean field theory. We find that a staggered $\eta$-type superconducting phase can be realized on a bipartite lattice in the high photodoping regime, if the effective temperature of the photocarriers is sufficiently low. The $\eta$ superconducting state is stabilized by Hund coupling - a positive Hund coupling favors orbital-singlet spin-triplet $\eta$ pairing, whereas a negative Hund coupling stabilizes spin-singlet orbital-triplet $\eta$ pairing.

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Acknowledgements - We thank J. Li and M. Eckstein for providing their NESS DMFT solver and J. Li and S. Hoshino for helpful discussions. The calculations have been run on the beo05 and beo06 clusters at the University of Fribourg. We acknowledge support from ERC Consolidator Grant No. 724103 and from SNSF Grant No. 200021-196966.