Regensburg 2025 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 2: Nonequilibrium Quantum Systems (joint session TT/DY)

DY 2.7: Talk

Monday, March 17, 2025, 11:15–11:30, H31

Universal quench dynamics in Yukawa-Sachdev-Ye-Kitaev models — •Haixin Qiu and Stefan Kehrein — Institute for Theoretical Physics, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Understanding the non-equilibrium properties of non-Fermi liquids without quasiparticles is essential for exploring the dynamics of strongly correlated systems. Here we investigate the quantum quench of a non-Fermi liquid model, the Yukawa-Sachdev-Ye-Kitaev model with interactions involving one boson and q fermions and its lattice extensions. We compute various in and out of equilibrium quantities for general q within the large-N dynamical mean field scheme by integrating the Kadanoff-Baym equations. We find transient oscillations and relaxation dynamics are insensitive to the quench amplitudes deep inside the non-Fermi liquid phase. Notably, the relaxation dynamics involve two distinct transient temperatures and relaxation rates for bosonic and fermionic degrees of freedom, both of which show non-Fermi liquid or universal behaviors. Signatures of prethermalization are also found when quenching near the Fermi liquid phase.

This work is supported by Deutsche Forschungsgemeinschaft (DFG) SFB 1073 (217133147) and FOR 5522 (499180199).

Keywords: Yukawa-Sachdev-Ye-Kitaev model; non-Fermi liquid; Quantum quench; Universal dynamics; Prethermalization