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Topological semimetals provide an attractive platform because they combine metallic conductivity with topological states that can efficiently generate spin currents. However, while most studied systems rely on accidental band inversions, the SOT response of symmetry-enforced Dirac semimetals remains largely unexplored. Here, we demonstrate that the non-symmorphic symmetry-enforced Dirac semimetal hexagonal SrIrO3 exhibits record-high SOT efficiency. In situ angle-resolved photoemission spectroscopy on high-quality epitaxial thin films directly confirmed the topological Dirac semimetal state, revealing bulk Dirac points near the Fermi level and spin\u2013momentum locked surface states. Leveraging these synergistic features, we achieve a very high SOT efficiency of 2.26 and a substantial spin Hall conductivity of 0.96\u00a0\u00d7\u00a0105 ($\\rm{h}$-\u2009\/2e)\u00a0\u03a9\u22121\u00a0m\u22121, enabling perpendicular magnetization switching at an exceptionally low current density of 5.9\u00a0\u00d7\u00a0105\u00a0A\/cm2. Our findings establish symmetry-enforced topological semimetals as a robust materials platform for achieving superior charge\u2013spin conversion, opening a pathway toward ultra-low-power spintronic devices.<\/jats:p>","DOI":"10.1093\/nsr\/nwag077","type":"journal-article","created":{"date-parts":[[2026,2,3]],"date-time":"2026-02-03T12:37:44Z","timestamp":1770122264000},"source":"Crossref","is-referenced-by-count":1,"title":["Symmetry-enforced topological Dirac semimetal for giant spin\u2013orbit torque with ultralow power dissipation"],"prefix":"10.1093","volume":"13","author":[{"given":"Xuan","family":"Zheng","sequence":"first","affiliation":[{"name":"Zhejiang Province Key Laboratory of Magnetic Materials and Applications, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201 ,","place":["China"]},{"name":"New Materials Institute, University of Nottingham Ningbo China , Ningbo 315100 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