Out-of-time-order correlators in the one-dimensional XY model

Jia-Hui Bao,Cheng-Yong Zhang

Figure 8. Late-time behavior of $| {F}_{{xx}}| $ at low temperature β = 500. Blue, purple, and green lines correspond to fixed locations l = 2, 3, and 4 respectively. The OTOC is observed to be divergent at late-time.