Similar Early Growth of Out-of-time-ordered Correlators in Quantum Chaotic and Integrable Ising Chains *

Hua Yan,Jiao-Zi Wang,Wen-Ge Wang

Fig. 3 (Color online) Variation of $C_{xx}(l,t)$ with the time $t$ at different initial temperature $\beta$, in the defect quantum Ising chain with $l=5$ and under the open boundary condition. The early increase of the OTOC is almost independent of the value of $\beta$.