Direction-selective triplet pairing and spin-edge locking in altermagnetic metals
Abstract
We investigate self-consistent unconventional superconductivity in a two-dimensional d-wave altermagnetic metal. We find that momentum-dependent altermagnetic spin splitting suppresses opposite-spin singlet pairing and stabilizes highly anisotropic equal-spin triplet order. In the spin-conserving limit, this directional triplet pairing gives rise to nearly dispersionless Majorana boundary states associated with effective one-dimensional topological channels. Rashba spin-orbit coupling mixes spin sectors, activates additional pairing components, and drives the system into a mixed-parity superconducting state with dispersive Majorana boundary states. The spin-resolved boundary spectra further reveal a characteristic locking between boundary orientation and spin polarization, reflecting the underlying altermagnetic symmetry. These results identify altermagnetic spin splitting as an intrinsic mechanism for selecting unconventional pairing and generating spin-resolved Majorana boundary states without external magnetic fields.
Versions
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BibTeX
@misc{yuan2026directionselective,
title = {{Direction-selective triplet pairing and spin-edge locking in altermagnetic metals}},
author = {Lie Yuan and Junkang Huang and Yu-Xuan Li and Tao Zhou},
howpublished = {arXiv},
year = {2026},
month = may,
doi = {10.48550/arxiv.2605.18429},
eprint = {2605.18429},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.18429},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Direction-selective triplet pairing and spin-edge locking in altermagnetic metals
AU - Lie Yuan
AU - Junkang Huang
AU - Yu-Xuan Li
AU - Tao Zhou
PY - 2026
DA - 2026/05/18
PB - arXiv
DO - 10.48550/arxiv.2605.18429
UR - https://arxiv.org/abs/2605.18429
AB - We investigate self-consistent unconventional superconductivity in a two-dimensional d-wave altermagnetic metal. We find that momentum-dependent altermagnetic spin splitting suppresses opposite-spin singlet pairing and stabilizes highly anisotropic equal-spin triplet order. In the spin-conserving limit, this directional triplet pairing gives rise to nearly dispersionless Majorana boundary states associated with effective one-dimensional topological channels. Rashba spin-orbit coupling mixes spin sectors, activates additional pairing components, and drives the system into a mixed-parity superconducting state with dispersive Majorana boundary states. The spin-resolved boundary spectra further reveal a characteristic locking between boundary orientation and spin polarization, reflecting the underlying altermagnetic symmetry. These results identify altermagnetic spin splitting as an intrinsic mechanism for selecting unconventional pairing and generating spin-resolved Majorana boundary states without external magnetic fields.
ER -