Periodic Electron Circulation Induced by Circularly Polarized Laser Pulses: Quantum Model Simulations for Mg Porphyrin

摘要

During the last two decades,femtosecond laser pulses in the time domain from about five to several hundred fs (1 fs = 10~(-5) s) have been used for analysis and control of molecular reaction dynamics,supplemented by quantum simulations and predictions of the laser-driven nuclear wavepacket dynamics.The recent advent of even shorter laser pulses from about one hundred attoseconds (1 as= 10~(-18) s) to a few fs has opened an analogous field of research,namely,the analysis and control of electron dynamics in the time domain in which the nuclei are essentially frozen.The first purpose of the work described here was to design corresponding circularly polarized laser pulses to induce periodic unidirectional circulation of electronic wavepackets in ring-shaped molecules such as Mg porphyrin (see Figure 1).