Dynamical instabilities and transient short-range order in the fermionic Hubbard model

Abstract

We study the dynamics of magnetic correlations in the half-filled fermionic Hubbard model following a fast ramp of the repulsive interaction. We use Schwinger-Keldysh self-consistent second-order perturbation theory to investigate the evolution of single-particle Green's functions and solve the non-equilibrium Bethe-Salpeter equation to study the dynamics of magnetic correlations. This approach gives us new insights into the interplay between single-particle relaxation dynamics and the growth of antiferromagnetic correlations. Depending on the ramping time and the final value of the interaction, we find different dynamical behavior which we illustrate using a dynamical phase diagram. Of particular interest is the emergence of a transient short-range ordered regime characterized by the strong initial growth of antiferromagnetic correlations followed by a decay of correlations upon thermalization. The discussed phenomena can be probed in experiments with ultracold atoms in optical lattices.

4 pages, 3 figures

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• Transient Floquet engineering of superconductivity
• Memory truncated Kadanoff-Baym equations
• Electronic and fluctuation dynamics following a quench to the superconducting phase
• Noise Correlations in time- and angular-resolved photoemission spectroscopy
• Nonequilibrium susceptibility in photoinduced Floquet states
• Inhomogeneous disordering at a photo-induced charge density wave transition
• Dynamical Mean Field Theory extension to the nonequilibrium Two-Particle Self-Consistent approach
• Non-equilibrium evolution of the optical conductivity of the weakly interacting Hubbard model: Drude response and $\pi$-ton type vertex corrections
• Charge and pairing dynamics in the attractive Hubbard model: mode coupling and the validity of linear-response theory
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