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arXiv 2304.08899quant-phnlin.CD
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两体线性 kicked rotor 系统中的混沌与局域化相

Chaos and localized phases in a two-body linear kicked rotor system

Anjali Nambudiripad, J. Bharathi Kannan, M. S. Santhanam

AI总结:

本研究通过两体线性 kicked rotor 系统,证明动量相互作用可诱发混沌,并揭示量子动力学中多种局域化与扩散相,利用有效希尔伯特空间维度解释纠缠增长。

摘要:

尽管存在周期性的 kicks,线性 kicked rotor(LKR)是一个可积且精确可解的模型,其中动能项在动量上是线性的。最近的研究表明,空间相互作用的 LKR 也是可积的,并在相应的量子区域中导致动力学局域化。类似的局域化相也存在于其他非可积模型中,例如耦合的相对论性 kicked rotors。本工作利用两体 LKR,展示了两个主要结果:首先,证明了混沌可以通过转子动量之间的相互作用在可积的线性 kicked rotor 中诱发。我们获得了其 Lyapunov 指数的解析估计。其次,该混沌模型的量子动力学在改变 kicking 和相互作用强度时,表现出多种相——经典诱发的局域化、动力学局域化、次扩散和扩散相。我们指出了这些相在该系统中纠缠产生的特征。通过定义一个有效的希尔伯特空间维度,纠缠增长率可以使用适当的随机矩阵平均来理解。

英文摘要:

Despite the periodic kicks, a linear kicked rotor (LKR) is an integrable and exactly solvable model in which the kinetic energy term is linear in momentum. It was recently shown that spatially interacting LKRs are also integrable, and results in dynamical localization in the corresponding quantum regime. Similar localized phases exist in other non-integrable models such as the coupled relativistic kicked rotors. This work, using a two-body LKR, demonstrates two main results; firstly, it is shown that chaos can be induced in the integrable linear kicked rotor through interactions between the momenta of rotors. An analytical estimate of its Lyapunov exponent is obtained. Secondly, the quantum dynamics of this chaotic model, upon variation of kicking and interaction strengths, is shown to exhibit a variety of phases -- classically induced localization, dynamical localization, subdiffusive and diffusive phases. We point out the signatures of these phases from the perspective of entanglement production in this system. By defining an effective Hilbert space dimension, the entanglement growth rate can be understood using appropriate random matrix averages.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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