High-temperature $\eta$-pairing superconductivity in the photodoped Hubbard model

TL;DR

This paper demonstrates the emergence of high-temperature $ ext{eta}$-pairing superconductivity in a photodoped Hubbard model using nonequilibrium dynamical mean-field theory, revealing a new route to controllable high-temperature superconductivity.

Contribution

It introduces a novel nonequilibrium phase diagram for $ ext{eta}$-pairing superconductivity in the Hubbard model with high critical temperatures, using advanced impurity solvers.

Findings

Identification of a superconducting gap in spectral functions.

Spectroscopic signatures consistent with experimental detection.

High effective critical temperature for photoinduced superconductivity.

Abstract

We investigate superconductivity emerging in the photodoped Mott insulating Hubbard model using steady-state dynamical mean-field theory implemented on the real-frequency axis. By employing high-order strong-coupling impurity solvers, we obtain the nonequilibrium phase diagram for photoinduced $\eta$-pairing superconductivity with a remarkably high effective critical temperature. We further identify a superconducting gap in the momentum-resolved spectral function and optical conductivity, providing spectroscopic signatures accessible to experiments. Our results highlight a route to a controllable form of high-temperature superconductivity in nonequilibrium strongly correlated systems, fundamentally distinct from the equilibrium $s$-wave pairing state in the attractive Hubbard model or cuprate-like $d$-wave superconductors.