Low‐Symmetry Weyl Semimetals: A Path to Ideal Topological States

Weyl semimetals have emerged as a transformative class of topological materials, offering unique quantum properties with significant implications for next‐generation electronic and information technologies. However, realizing an ideal Weyl semimetal, one with a minimal number of well‐isolated Weyl nodes at the Fermi level, remains a major challenge due to band entanglement and extraneous electronic states. In this work, a simplified time‐reversal invariant model is introduced that demonstrates the emergence of Weyl nodes under minimal symmetry constraints. Using first‐principles calculations, the monoclinic phase of Cu 2 SnSe 3 is identified as a promising material candidate, hosting four isolated Weyl nodes near the Fermi level. Key physical properties are further investigated, including current‐induced orbital magnetization, the circular photogalvanic effect, and thermoelectric transport, revealing the potential for novel device functionalities. The distinctive interplay of topology, symmetry and spin‐orbit interactions in Cu 2 SnSe 3 presents a viable platform for fundamental studies and application‐driven research in topological materials.