报告题目：Tunneling exit characteristics from back propagation

报 告 人：倪宏程

Technische Universität Wien博士后研究助理

报告时间：7月7日（周六）8:30

报告地点：南区唐敖庆楼C区603讲学厅

主办单位：原子与分子物理研究所

报告人简介：   倪宏程博士，本科毕业于南京大学，获University of Colorado博士学位，主修强场超快原子分子光物理理论。研究方向包括多电子原子体系中的光电离延时；超快过程阿秒种刻度校准；原子、分子强场隧穿电离出口特性、氦二聚体的单、双光子电离；原子少光子电离中的光吸收延时；原子、分子少光子双电离中的选择定则。

Abstract:  We investigate tunneling ionization of a model helium atom in a strong circularly polarized short laser pulse using the classical backpropagation method and compare ten different tunneling criteria on the same footing, aiming for a consistent classical picture of the tunneling dynamics. These tunneling criteria are categorized into velocity-based, position-based, and energy-based criteria, according to different notions of a tunnel exit. We find that velocity-based criteria give consistent tunneling exit characteristics with nonadiabatic effects fully included. Other criteria are either inconsistent, or only able to include nonadiabatic effects partially. Furthermore, we construct a simple tunneling rate formula, identify a term in the rate responsible for the nonadiabatic effects, and demonstrate the importance of this term.