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arXiv physics/0310143physics.atom-phnlin.CDphysics.gen-ph
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相空间中稳定周期轨道附近的量子力学累积动力学:应用于量子加速器模式的类经典动力学

Quantum Mechanical Cumulant Dynamics near Stable Periodic Orbits in Phase Space: Application to the classical-like dynamics of quantum accelerator modes

R. Bach, K. Burnett, M. B. d'Arcy, S. A. Gardiner

摘要:

为了从理论上研究量子加速器模的动力学,我们提出了一种研究混合相空间稳定区域中类半经典动力学的一般方法。在最简单的情况下,这涉及到确定解决方案,这是稳定的约束时,保持纯态高斯波包,然后使用基于累积量的形式主义传播它们。使用这种方法,我们研究的相对寿命,在不同的参数制度,量子加速器模式。在这个吸引人的简单的形式主义,我们能够获得良好的定性协议与精确的波函数动力学。

英文摘要:

We formulate a general method for the study of semiclassical-like dynamics in stable regions of a mixed phase-space, in order to theoretically study the dynamics of quantum accelerator modes. In the simplest case, this involves determining solutions, which are stable when constrained to remain pure-state Gaussian wavepackets, and then propagating them using a cumulant-based formalism. Using this methodology, we study the relative longevity, under different parameter regimes, of quantum accelerator modes. Within this attractively simple formalism, we are able to obtain good qualitative agreement with exact wavefunction dynamics.

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