Eberlein, AndreasSachdev, SubirSteinberg, Julia2019-07-232017-11-14Eberlein, Andreas, Valentin Kasper, Subir Sachdev, and Julia Steinberg. 2017. Quantum Quench of the Sachdev-Ye-Kitaev Model. Physics Review B 96: 205123.2469-99502469-9969http://nrs.harvard.edu/urn-3:HUL.InstRepos:40992632We describe the nonequilibrium quench dynamics of the Sachdev-Ye-Kitaev models of fermions with random all-to-all interactions. These provide tractable models of the dynamics of quantum systems without quasiparticle excitations. The Kadanoff-Baym equations show that, at long times, the fermion two-point function has a thermal form at a final temperature determined by energy conservation, and the numerical analysis is consistent with a thermalization rate proportional to this temperature. We also obtain an exact analytic solution of the quench dynamics in the large q limit of a model with q fermion interactions: in this limit, the thermalization of the two-point function is instantaneous.en-USJournal Article2019-07-2310.1103/physrevb.96.205123