Related papers: Krylov Complexity as a Probe for Chaos

Krylov Complexity as a Probe for Chaos

URL: http://arxiv.org/abs/2408.10194v2
Date: Mon, 9 Sep 2024 19:06:32 GMT
Title: Krylov Complexity as a Probe for Chaos
Authors: Mohsen Alishahiha, Souvik Banerjee, Mohammad Javad Vasli,
Abstract summary: We show that the dynamics towards saturation precisely distinguish between chaotic and integrable systems. For chaotic models, the saturation value of complexity reaches its infinite time average at a finite saturation time. In integrable models, complexity approaches the infinite time average value from below at a much longer timescale.
Score: 0.7373617024876725
License: http://creativecommons.org/licenses/by/4.0/
Abstract: In this work, we explore in detail, the time evolution of Krylov complexity. We demonstrate, through analytical computations, that in finite many-body systems, while ramp and plateau are two generic features of Krylov complexity, the manner in which complexity saturates reveals the chaotic nature of the system. In particular, we show that the dynamics towards saturation precisely distinguish between chaotic and integrable systems. For chaotic models, the saturation value of complexity reaches its infinite time average at a finite saturation time. In this case, depending on the initial state, it may also exhibit a peak before saturation. In contrast, in integrable models, complexity approaches the infinite time average value from below at a much longer timescale. We confirm this distinction using numerical results for specific spin models.

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