Quantization of Spin Circular Photogalvanic Effect in Altermagnetic Weyl Semimetals

Author(s): Hiroki Yoshida, Jan Priessnitz, Libor Šmejkal, and Shuichi Murakami We theoretically predict a spin-current analog of the quantized circular photogalvanic effect in Weyl semimetals. This phenomenon is forbidden in antiferromagnets by symmetry but uniquely allowed in altermagnets, highlighting a novel and intrinsic characteristic of altermagnetism. To systematically … [Phys. Rev. Lett. 136, 096701] Published Mon Mar 02, 2026