Nonequilibrium Dynamical Quantum Phase Transitions in the Extended Agassi Model

Abstract

We investigate dynamical quantum phase transitions (DQPTs) in the extended Agassi model following sudden quenches of same level pairing ($\Sigma$), monopole-monopole ($\chi$) and cross level pairing ($\Lambda$) strengths. Using exact diagonalization, we characterize the non-equilibrium dynamics through the Loschmidt echo and intensive return-rate function. Quenches across equilibrium phase boundaries produce cusp-like structures in the return rate that shows non-analyticities with increasing system size. Equilibrium finite size to large scaling identifies the $\chi$-driven transition as a second order phase transition similar to mean-field, Dicke, and Lipkin-Meshkov-Glick (LMG) models critical behaviour with the exponent of the order parameter $\beta \simeq 1/2$, while the $\Sigma$- and $\Lambda$-driven transitions are first order. We further characterize the associated dynamical singularities through a local scaling exponent $\alpha$, with $\alpha_\chi \simeq 2/3$, $\alpha_\Lambda \simeq 1/3$, and $\alpha_\Sigma \simeq 3/2$ of all three parameters. The distinct scaling behaviours across the parameter channels show that dynamical criticality is not determined solely by the equilibrium order of the transition, revealing multiple dynamical scaling regimes. These non-analyticities are associated with the Fisher zeros of the Loschmidt amplitude, which cross the real time axis at critical times and the time derivatives of the return-rate function to characterize the order of DQPTs within the extended Agassi model.