The emerging altermagnetism, featured by robust time-reversal symmetry breaking, antiparallel magnetic order, and alternating spin-splitting band structures, enables phenomena and functionalities that are inaccessible in conventional collinear ferromagnets and antiferromagnets. In this study, we employ first-principles calculations and a tight-binding model to investigate the potential of altermagnetism in quasi-one-dimensional nanotubes derived from altermagnetic monolayer ${\mathrm{V}}_2{\mathrm{Se}}_2\mathrm{O}$. Our findings demonstrate that rolling an altermagnetic monolayer into a nanotube generates a diverse array of chirality-dependent magnetic properties. Notably, $(n,0)$ nanotubes exhibit pronounced alternating spin-splitting band structures, whereas such a spin-splitting phenomenon is entirely absent in $(n,n)$ nanotubes. Furthermore, we analyze the effects of curvature on the energetic stability, spin-splitting, and band edges of the ${\mathrm{V}}_2{\mathrm{Se}}_2\mathrm{O}$ nanotubes. These results expand the understanding of altermagnetism and present avenues for the customization of properties and functionalities in low-dimensional altermagnetic materials.

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• Electronic structure
• Altermagnets
• Nanotubes