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However, its realization remains rare, often requiring complicated band structures or fine-tuned spin\u2013orbit coupling. Here, we propose a universal and robust mechanism to generate Weyl TSC relying solely on 3D cubic lattice symmetry under repulsive electron\u2013electron interaction. Standard group theory combined with Ginzburg\u2013Landau analysis reveals that generalizing the $d_{x^2-y^2}$-wave pairing in the 2D square lattice, typically driven by repulsive interactions, to a 3 dimensional (3D) cubic lattice naturally yields a chiral $d_{3z^2-r^2}+ i d_{x^2-y^2}$ state. Unlike other time-reversal symmetry breaking pairings such as $p_x+ip_y$ (for example, $^3$He-A) and $d_{x^2-y^2}+id_{xy}$ under planar hexagonal symmetry, Cooper pairs with such a symmetry do not possess a net orbital angular momentum (OAM). Instead, they develop an octupolar $O_{xyz}$ component of OAM, which results in eight nodal points along the body diagonal directions, exhibiting an alternating distribution of monopole charges $\\pm 1$. This naturally constitutes an octupolar Weyl TSC with non-trivial topology. Employing the single-orbital cubic Hubbard model as a prototype, we utilize a weak-coupling approach within the random-phase approximation, along with a strong-coupling analysis based on slave-boson mean-field theory and variational Monte Carlo simulations. Our numerical results consistently confirm the emergence of the $d+id$ Weyl TSC, highlighting the universality of this interaction-driven symmetry-protected mechanism. This finding simplifies the search for Weyl TSC, suggesting potential realization in cubic-lattice correlated superconductors and in cold-atom quantum simulation of the 3D Hubbard model upon suppression of its N\u00e9el antiferromagnetic phase.<\/jats:p>","DOI":"10.1093\/nsr\/nwag326","type":"journal-article","created":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T11:24:32Z","timestamp":1780313072000},"source":"Crossref","is-referenced-by-count":2,"title":["Octupolar Weyl superconductivity from electron\u2013electron interaction"],"prefix":"10.1093","volume":"13","author":[{"given":"Zhiming","family":"Pan","sequence":"first","affiliation":[{"name":"Xiamen University Department of Physics, , Xiamen 361005 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Physics, Hangzhou Normal University , Hangzhou 311121 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fan","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Physics, Beijing Institute of Technology , Beijing 100081 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Congjun","family":"Wu","sequence":"additional","affiliation":[{"name":"New Cornerstone Science Laboratory, Department of Physics, School of Science, Westlake University , Hangzhou 310024 ,","place":["China"]},{"name":"Institute for Theoretical Sciences, Westlake University , Hangzhou 310024 ,","place":["China"]},{"name":"Key Laboratory for Quantum Materials of Zhejiang Province, School of Science, Westlake University , Hangzhou 310024 ,","place":["China"]},{"name":"Institute of Natural Sciences, Westlake Institute for Advanced Study , Hangzhou 310024 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