GdAlSi: A potential candidate for antiferromagnetic Weyl semimetal

We report the theoretical prediction of a new Weyl semimetal (WSM), which is also supported by our experimental findings. WSMs are novel quantum phase, which are known to host emerging Weyl fermions as a result of either broken time-reversal symmetry or inversion symmetry. We predict such a unique WSM feature in a non-centrosymmetric magnetic crystal GdAlSi. GdAlSi crystallizes in a perfect body-centered tetragonal structure with space group I4₁md (#109). The magnetization data indicates antiferromagnetic ordering with the ordering temperature (T_N) 32 K. Our ab-initio simulation confirms emerging topological properties in this system. Moreover, our experimental results further support the novel WSM phase in GdAlSi. Hence, our study on this quantum composite material provides a new direction for exploring the emerging topological states for future research and applications in topotronics.