Altermagnetism has been widely explored in three- and two-dimensional crystals, but its one-dimensional realization remains largely unexplored. Here, we propose an altermagnetic nanotube formed by rolling a two-dimensional altermagnet, which converts symmetry-enforced directional spin anisotropy in momentum space into spin-chirality locking in the screw-symmetric geometry. Unlike curvature-induced magnetization in bent films, the nanotube remains compensated and produces no net magnetization. Two reciprocal effects emerge: (i) Spin-selective injection drives a helical current whose handedness is fixed by the spin, yielding opposite-sign axial magnetic fields; and (ii) a time-varying axial flux generates a circumferential Faraday field that drives equal and opposite axial charge currents in the two fixed spin channels, yielding a charge-neutral spin-channel current in the open-circuit weak spin-orbit coupling limit. Explicit first-principles calculations of the relaxed ${\mathrm{V}}_2{\mathrm{Se}}_2\mathrm{O}$ nanotube reveal spin-resolved helical ${\left|\psi \right|}^2$ modulations near both band edges, while a parent-monolayer Wannier-Boltzmann calculation quantifies the energy-dependent spin-odd transverse response and corresponding ideal thin-wall field scale.

Close

PrevNext

View figure in article

• Altermagnetism
• 2-dimensional systems
• Altermagnets
• Nanotubes
• First-principles calculations