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arXiv quant-ph/9906003quant-ph
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量子力学中吸收的Feynman积分方法

Feynman Integral Approach to Absorption in Quantum Mechanics

A. Marchewka, Z. Schuss

摘要:

我们提出了一个量子粒子吸收边界的公式。该配方是基于一个费曼型积分的轨迹,所限制的吸收边界。到达吸收壁的轨迹被瞬间终止,它们的概率从幸存轨迹的总体中扣除。这引起在边界处的单向吸收电流。我们计算生存概率作为时间的函数。从我们的形式主义中可以推导出几种吸收模式:全吸收、依赖于能级的吸收和非相互作用粒子的吸收。给出了几种应用:该狭缝实验具有吸收屏和吸收侧壁,以及在两个吸收壁之间的一维颗粒。粒子在吸收壁之间的存活概率随拍频衰减。

英文摘要:

We propose a formulation of an absorbing boundary for a quantum particle. The formulation is based on a Feynman-type integral over trajectories that are confined by the absorbing boundary. Trajectories that reach the absorbing wall are instantaneously terminated and their probability is discounted from the population of the surviving trajectories. This gives rise to a unidirectional absorption current at the boundary. We calculate the survival probability as a function of time. Several modes of absorption are derived from our formalism: total absorption, absorption that depends on energy levels, and absorption of non-interacting particles. Several applications are given: the slit experiment with an absorbing screen and with absorbing lateral walls, and one dimensional particle between two absorbing walls. The survival probability of a particle between absorbing walls exhibits decay with beats.

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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