Quantum and Semiclassical Trajectories: Development and Applications

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Original Research
17 February 2023
Scaling laws of out-of-time-order correlators in a non-Hermitian kicked rotor model
Wen-Lei Zhao
 and 
Ru-Ru Wang
Comparison of the distribution of states |ψR (t0)⟩ (solid lines) and |φR (t0)⟩ (dashed lines) in real (A, C, E) and momentum space (B, D, F) with B = p (top panels), p2 (middle panels), and p3 (bottom panels). Blue dashed lines in (B, D, F) indicate the power-law decay |ψR (t0)|2 (|φR (t0)|2) ∝ p−2. The parameters are the same as in Figure 2.

We investigate the dynamics of the out-of-time-order correlators (OTOCs) via a non-Hermitian extension of the quantum kicked rotor model, where the kicking potential satisfies PT-symmetry. The spontaneous PT-symmetry breaking emerges when the strength of the imaginary part of the kicking potential exceeds a threshold value. We find, both analytically and numerically, that in the broken phase of PT symmetry, the OTOCs rapidly saturate with time evolution. Interestingly, the late-time saturation value scales as a pow-law in the system size. The mechanism of such scaling law results from the interplay between the effects of the nonlocal operator in OTOCs and the time reversal induced by non-Hermitian-driven potential.

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