Exploration of Altermagnetic Material Candidates in (Magnetic) Space Groups

Altermagnetism, characterized by collinear spin alignment and the breaking of time-reversal symmetry, results in identical spin states for opposite momenta. Typically, inversion symmetry is required to maintain these identical spin states, leading most altermagnetic material candidates to be centrosymmetric. In this study, we propose an effective global symmetry that can substitute inversion symmetry to maintain identical spin states. By relaxing the constraint of inversion symmetry, We can explore altermagnetic candidates beyond centrosymmetric systems, investigating a broader range of materials within (magnetic) space groups. This approach aims to identify new and diverse candidates for altermagnetic materials.