Abstract
We theoretically investigate the electron vortices in photoionization of hydrogen atom by a pair of right-left circularly polarized attosecond pulses by numerically solving the two-dimensional (2D) time-dependent Schro¨dinger equation (TDSE). We demonstrate that the vortex structures rotate as the varying time delay within one-cycle. We also investigate the photoelectron momentum distributions (PMDs) generated from the interference effect of the two pulses which is used to demonstrate the generation of the electron vortices. The effect of the wavelength and CEP on the vortex structure is illustrated. The attosecond perturbation ionization theory is employed to analyze the corresponding physical mechanisms.
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