从量子到经典描述的强laser -原子物理与Bohmian轨迹
From quantum to classical description of intense laser-atom physics with Bohmian trajectories
摘要：
本文将玻姆力学引入强激光原子物理中。从玻姆-牛顿方程出发，得到了原子电子在强激光场中的运动规律。我们发现，当强激光场将电子驱离母体离子时，主导物理系统量子效应的量子势变得可以忽略，即电子在电离后不久，其行为就平滑地趋向于经典.我们的数值计算为强激光-原子物理中电离电子的运动用经典力学处理，而电离前需要用量子力学处理的半经典轨道方法提供了直接的证据。
英文摘要：
In this paper, Bohmian mechanics is introduced to the intense laser-atom physics. The motion of atomic electron in intense laser field is obtained from the Bohm-Newton equation. We find the quantum potential that dominates the quantum effect of a physical system becomes negligible as the electron is driven far away from the parent ion by the intense laser field, i.e. the behavior of the electron smoothly trends to be classical soon after the electron was ionized. Our numerical calculations present a direct positive evidence for the semiclassical trajectory methods in the intense laser-atom physics where the motion of the ionized electron is treated by the classical mechanics, while quantum mechanics is needed before the ionization.
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