Out-of-time-order correlators in the one-dimensional XY model
Jia-Hui Bao,Cheng-Yong Zhang
Figure 2. General evolution of Czz with different choices of parameters in the XY model. We set the system size N = 500, inverse temperature β = 0. The space coordinate l ranges from −30 to 30. The time coordinate ranges from 0 to 30. Lighter color denotes a larger value of Czz, corresponding to stronger delocalization. These images clearly show how the spreading of the operator is bounded by a ‘cone structure'.