Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 50: Superconductivity: Theory II

TT 50.4: Talk

Wednesday, March 20, 2024, 15:45–16:00, H 3005

Nonthermal superconductivity in photodoped multiorbital Hubbard systems — •Sujay Ray — University of Fribourg, 1700 Fribourg, Switzerland

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.

Keywords: Non-equilibrium; Strongly correlated system; Mott insulator; Laser excitation; non-equilibrium DMFT