Quantum coherent π-electron rotations in a non-planar chiral molecule induced by using a linearly polarized UV laser pulse

We propose an ultrafast quantum switching method of ?-electron rotations, which are switched among four rotational patterns in a nonplanar chiral aromatic molecule (P)-2,2?- biphenol and perform the sequential switching among four rotational patterns which are performed by the overlapped pump-dump laser pulses. Coherent ?-electron dynamics are generated by applying the linearly polarized UV pulse laser to create a pair of coherent quasidegenerated excited states. We also plot the time-dependent ?-electron ring current, and discussed ring current transfer between two aromatic rings.