Non-equilibrium superconductivity in a correlated electron system studied with the Keldysh+FLEX approach

TL;DR

This paper investigates non-equilibrium phase transitions in a 2D Hubbard model under bias voltages, using a combined Keldysh+FLEX approach to analyze the emergence of magnetic and superconducting phases.

Contribution

It introduces a novel theoretical framework combining fluctuation exchange approximation with Keldysh method to study non-equilibrium phenomena in correlated electron systems.

Findings

Mapped the phase diagram showing transitions to magnetic and superconducting phases under bias.

Characterized properties of the non-equilibrium Fermi liquid phase.

Identified conditions for phase transitions driven by bias voltages.

Abstract

Non-equilibrium phase transitions are studied theoretically for the two-dimensional Hubbard model subject to bias voltages from the electrodes coupled to the system. By combining the fluctuation exchange approximation with the Keldysh method for non-equilibrium, we have studied the properties of the non-equilibrium Fermi liquid phase and determined the phase diagram with transition to non-equilibrium magnetic and superconducting phases.