Topic:Tunneling exit characteristics from back propagation                    

Repoter:Dr. Ni Hongcheng

Time: 8:30 am, July 7, 2017

Location: 603 Lecture Hall, Tang Aoqing Building C

Hosted by: Institute of Atomic and Molecular Physics

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.