We predict that bismuth and nickel atoms co-confined in chabazite (CHA) zeolite real- ize a self-contained one-dimensional topological superconductor hosting Majorana zero modes. The platform exploits four confinement effects: (1) Bi atomic chains exhibit Z₂ = 1 topological character with 600 meV spin-orbit coupling from s-p band inversion; (2) quasi-1D Ni confinement suppresses ferromagnetism via the Mermin-Wagner theorem, enabling superconductivity at Tc ~ 7-25 K; (3) residual inter-chain ordering provides an internal Zeeman field VZ = 3. 66 meV via direct Bi-Ni s-d exchange at d = 2. 8 Angstrom; and (4) the Kitaev criterion is satisfied with VZ/Delta = 2. 61, yielding a topological gap of 1. 29 meV and Majorana coherence length 133 nm. No external magnetic field, prox- imity superconductor, or dilution refrigerator is required: the system operates at 3. 0 K with spin-orbit coupling 2, 400 times that of InSb nanowires. These predictions identify zeolite-confined atomic chains as a scalable route to topological qubits.
Bradley John Hart (Sat,) studied this question.