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The recent discovery of the Weyl semimetal CeAlSi with simultaneous breakingof inversion and time-reversal symmetries has opened up new avenues forresearch into the interaction between light and topologically protected bands.In this work, we present a comprehensive examination of shift current andinjection current responsible for the circular photogalvanic effect in CeAlSiusing first-principles calculations. Our investigation identifies a significantinjection current of 1.2 mA/V$^2$ over a broad range in the near-infraredregion of the electromagnetic spectrum, exceeding previously reported findings.In addition, we explored several externally controllable parameters to furtherenhance the photocurrent. A substantial boost in the injection current isobserved when applying uniaxial strain along the $c$-axis of the crystal $-$ a5% strain results in a remarkable 64% increment. The exceptional photocurrentresponse in CeAlSi suggests that magnetic non-centrosymmetric Weyl semimetalsmay provide promising opportunities for novel photogalvanic applications.

Large circular photogalvanic effect in non-centrosymmetric magnetic Weyl semimetal CeAlSi