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We show that the intensity of pumped states near Weyl point is different whenpumped with left- and right-handed circular polarized light, which leads to aspecial circular dichroism (CD) in time-dependent angle resolved photoemissionspectra (ARPES). We derive the expression for the CD of time-dependent ARPES,which is directly related to the chirality of Weyl fermions. Based on the abovederivation, we further propose a method to determine the chirality for a givenWeyl point from the CD of time-dependent ARPES. The corresponding CD spectrafor TaAs has then been calculated from the first principle, which can becompared with the future experiments.

Determine the chirality of Weyl fermions from the circular dichroism spectra of time-dependent ARPES