Chiral-Angle-Controlled Spin Splitting and Spin Transport in Nanotubes Rolled from d-wave Altermagnets
Abstract
Altermagnets combine compensated collinear magnetic order with momentum-dependent spin splitting in the electronic band structure. Here, we show that rolling a two-dimensional (2D) d-wave altermagnet into a nanotube converts this momentum dependence into chiral-angle-controlled one-dimensional (1D) spin splitting through dimensional projection. A minimal tight-binding model reveals a characteristic nodal--antinodal dependence on the chiral angle θ, with the central circumferential subband exhibiting a cos(2θ) scaling and the projected spin splitting vanishing for the nodal orientation and reversing sign between orthogonal antinodal orientations. First-principles calculations for V2O and representative symmetric and Janus systems demonstrate that this nodal--antinodal selection rule persists despite curvature-induced structural asymmetry and magnetic moment imbalance. We further show that the projected electronic structure produces chiral-angle-controlled spin-polarized transport: antinodal nanotubes exhibit spin-polarized transmission, whereas the nodal nanotube remains conducting with identical spin-channel transmission. These results demonstrate how dimensional projection can translate the momentum-space spin splitting of a 2D altermagnet into geometrically controlled electronic and transport properties in nanotubes.
Related
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BibTeX
@misc{sasioglu2026chiralanglecontrolled,
title = {{Chiral-Angle-Controlled Spin Splitting and Spin Transport in Nanotubes Rolled from d-wave Altermagnets}},
author = {Ersoy Sasioglu and Tom. G. Saunderson and Börge Göbel and Ingrid Mertig and Samir Lounis},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.08757},
eprint = {2606.08757},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.08757},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Chiral-Angle-Controlled Spin Splitting and Spin Transport in Nanotubes Rolled from d-wave Altermagnets
AU - Ersoy Sasioglu
AU - Tom. G. Saunderson
AU - Börge Göbel
AU - Ingrid Mertig
AU - Samir Lounis
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2606.08757
UR - https://arxiv.org/abs/2606.08757
AB - Altermagnets combine compensated collinear magnetic order with momentum-dependent spin splitting in the electronic band structure. Here, we show that rolling a two-dimensional (2D) d-wave altermagnet into a nanotube converts this momentum dependence into chiral-angle-controlled one-dimensional (1D) spin splitting through dimensional projection. A minimal tight-binding model reveals a characteristic nodal--antinodal dependence on the chiral angle θ, with the central circumferential subband exhibiting a cos(2θ) scaling and the projected spin splitting vanishing for the nodal orientation and reversing sign between orthogonal antinodal orientations. First-principles calculations for V_2O and representative symmetric and Janus systems demonstrate that this nodal--antinodal selection rule persists despite curvature-induced structural asymmetry and magnetic moment imbalance. We further show that the projected electronic structure produces chiral-angle-controlled spin-polarized transport: antinodal nanotubes exhibit spin-polarized transmission, whereas the nodal nanotube remains conducting with identical spin-channel transmission. These results demonstrate how dimensional projection can translate the momentum-space spin splitting of a 2D altermagnet into geometrically controlled electronic and transport properties in nanotubes.
ER -