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  • Open Access

Universal quench dynamics of q-fermion Yukawa-Sachdev-Ye-Kitaev models

Haixin Qiu* and Stefan Kehrein†

  • *Contact author: haixin.qiu@theorie.physik.uni-goettingen.de
  • †Contact author: stefan.kehrein@theorie.physik.uni-goettingen.de
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Phys. Rev. B 112, 115156 – Published 29 September, 2025

DOI: https://doi.org/10.1103/6kj9-lvxw

Abstract

We study the quantum quench of the Yukawa-Sachdev-Ye-Kitaev model and one of its random hopping extensions with q fermions and one boson. Several equilibrium properties are computed for general q with different parameter scaling within the large-N dynamical mean-field scheme. The non-Fermi liquid quench dynamics are studied by integrating the Kadanoff-Baym equations for switching off the random hopping term with constant Yukawa coupling or quenching to different final Yukawa couplings. The postquench oscillations and relaxation dynamics are insensitive to the quench amplitudes deep inside the non-Fermi liquid phase. With weak hopping coupling quenches, we find universal thermalization dynamics similar to the SYK model; however, with two temperatures and two distinct relaxation rates for bosons and fermions, both signal Planckian relaxations without quasiparticles, as in strange metals.

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Phys. Rev. B 112, 115156– Published 29 September, 2025
  • Received 21 May 2025
  • Revised 24 July 2025
  • Accepted 16 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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