Unidirectional Electronic Ring Current Driven by a Few Cycle Circularly Polarized Laser Pulse: Quantum Model Simulations for Mg−Porphyrin by Ingo Barth, Jörn Manz, Yasuteru Shigeta, Kiyoshi Yagi.
A circularly polarized ultraviolet (UV) laser pulse may excite a unidirectional valence-type electronic ring current in an oriented molecule, within the duration of few femtoseconds (e.g., tau = 3.5 fs). The mechanism is demonstrated by quantum model simulation for |X |1(1)A(1g) –> |E(+) |4 (1)E(u+) population transfer system, Mg-porphyrin. net generated (I 84.5 microA) at least 100 times stronger than any current, which could be induced means permanent magnetic fields, with present technology.