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It is shown that the Weyl semimetal TaAs can have a significant polar vectorcontribution to its optical activity. This is quantified by ab initiocalculations of the resonant x-ray diffraction at the Ta L1 edge. For the Braggvector (400), this polar vector contribution to the circular intensitydifferential between left and right polarized x-rays is predicted to becomparable to that arising from linear dichroism. Implications this result hasin regards to optical effects predicted for topological Weyl semimetals arediscussed.

Vector Optical Activity in the Weyl Semimetal TaAs