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arXiv quant-ph/0509086quant-phmath-phmath.MP
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高阶量子绝热近似的结构

Structure of high-order quantum adiabatic approximation

Alexei A. Mailybaev

摘要:

本文研究了慢变哈密顿量的波函数的高阶绝热近似的结构。提出了一种明确分离波函数快、慢分量的构造性方法。快速组件的动态相位确定,而缓慢的组件给出的渐近系列评估的一个明确的经常性的程序。结果表明,慢分量代表准绝热态,在概念上起着与定态系统中的能级或时间周期系统中的Floquet态相同的作用。作为应用,我们得到了周期哈密顿量的拟能的高阶渐近表达式。作为例子,研究了周期变化磁场中的两态(自旋为1/2)系统和运动方势阱中的粒子。

英文摘要:

The paper studies the structure of high-order adiabatic approximation of a wave function for slowly changing Hamiltonians. A constructive technique for explicit separation of fast and slow components of the wave function is developed. The fast components are determined by dynamic phases, while the slow components are given by asymptotic series evaluated by means of an explicit recurrent procedure. It is shown that the slow components represent quasiadiabatic states, which play conceptually the same role as energy levels in stationary systems or Floquet states in time-periodic systems. As an application, we derive high-order asymptotic expressions for quasienergies of periodic Hamiltonians. As examples, a two-state (spin-1/2) system in periodically changing magnetic filed, and a particle in moving square potential well are studied.

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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