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We propose a spin photogalvanic effect of magnons with broken inversionsymmetry. The dc spin photocurrent is generated via the Aharonov-Casher effect,which includes the Drude, Berry curvature dipole, shift, injection, andrectification components with distinct quantum geometric origin. Based on asymmetry classification, we uncover that there exist linearly polarized (LP)magnon spin photocurrent responses in the breathing kagome-lattice ferromagnetwith Dzyaloshinskii-Moriya interaction, and the circularly polarized (CP)responses due to the symmetry breaking by applying a uniaxial strain. Weaddress that the topological phase transitions can be characterized by the spinphotocurrents. This study presents a deeper insight into the nonlinearresponses of light-magnon interactions, and suggests a possible way to generateand control the magnon spin current in real materials.

Magnon Spin Photogalvanic Effect in Collinear Ferromagnets