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arXiv math-ph/9909027math-phmath.MP
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经典和量子系统中非线性薛定谔方程的混沌解

Chaotic solutions of the nonlinear Schrodinger equation in classical and quantum systems

F. V. Kusmartsev, K. E. Kurten, H. S. Dhillon

摘要:

讨论了几种量子自旋、电子和经典晶格系统的非线性薛定谔方程的定态解。我们表明,空间中可能会出现以无公度或不规则的量子态和轨道形式出现的混乱空间结构。作为第一个(典型的)例子,我们考虑一个单一的电子是强耦合的声子在一维链的原子。在绝热近似中,系统通常由离散的NSE集合描述。另一个恰当的例子是由相同的NSE描述的层状超导体中的超导态。在许多其他应用中,经典晶格的典型例子是耦合非线性振子系统。我们重新制定这个离散NSE的形式的二维映射。这样,我们就可以用传统上应用于经典混沌动力学的方法来研究量子问题。我们发现三种类型的解决方案:周期,拟周期和混沌。然后,我们开发了一个程序,使我们能够直接获得数值解的NSE。这个过程可以用于任何任意精度,因此这些解决方案是准确的精度指定的程度。这两种方法给出了一致的结果。当应用到我们的典型例子中时,我们发现电子在可变形晶格(以及其他量子或经典离散系统)上的波函数可能表现出无公度和不规则的结构。

英文摘要:

We discuss stationary solutions of the nonlinear Schrodinger equation (NSE) applicable to several quantum spin, electron and classical lattice systems. We show that there may arise chaotic spatial structures in the form of incommensurate or irregular quantum states and trajectories in space. As a first (typical) example we consider a single electron which is strongly coupled with phonons on a 1D chain of atoms. In the adiabatic approximation the system is conventionally described by a discrete set of NSEs. Another apt example is that of superconducting states in layered superconductors described by the same NSE. Amongst many other applications the typical example for a classical lattice is a system of coupled nonlinear oscillators. We reformulate this discrete NSE to the form of a 2D mapping. By this we may investigate a quantum problem by methods conventionally applied to classical chaotic dynamics. We find three types of solutions: periodic, quasiperiodic and chaotic. We then develop a procedure which allows us to obtain numerical solutions of the NSE directly. This procedure may be used to any arbitrary accuracy and so these solutions are exact to the degree of precision specified. Both methods give a consistent result. When applied to our typical example we find that the wave function of an electron on a deformable lattice (and other quantum or classical discrete systems) may exhibit incommensurate and irregular structures.

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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