Nonspreading wave packets

Nonspreading wave packets
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DOI:
10.1119/1.18177
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发表时间:
1996-06
影响因子:
0.9
通讯作者:
C. Wong
C. Wong
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
C. Wong

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通过求解埃伦费斯特定理方程,可以很容易地确定波包在一维线性势和二次势中的扩散或非扩散情况。对于二次势的结果,可以通过使用相空间中的量子分布函数,以简单直观的方式来理解。这些量子分布函数像经典分布一样,在每个运动周期内随时间顺时针旋转一次。对于更复杂的情况,例如量子能级间隔是基本单位整数倍的势场,通过研究其含时波函数或概率密度的量子重现,可以了解到很多信息。
The spreading or nonspreading of wave packets in one‐dimensional linear and quadratic potentials can readily be determined by solving Ehrenfest’s equations. The results for quadratic potentials can be understood in simple intuitive terms by using quantum distribution functions in phase space which, like classical distributions, rotate clocklike in time once per motional cycle. For more complicated situations, such as potentials with quantum energy spacings which are integral multiples of a basic unit, much can be learned instead by studying the quantum recurrence of their time‐dependent wave functions or probability densities.