Nonthermal superconductivity in photodoped multiorbital Hubbard systems
Sujay Ray, Yuta Murakami, Philipp Werner
DOI 10.1103/PhysRevB.108.174515 · Physical Review B
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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 η-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 η superconducting state is stabilized by Hund coupling—a positive Hund coupling favors orbital-singlet spin-triplet η pairing, whereas a negative Hund coupling stabilizes spin-singlet orbital-triplet η pairing.
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