Topological superconductivity in an altermagnet-superconductor heterostructure
Abstract
Fully gapped spin-triplet superconductors offer a natural setting for topological edge transport and Majorana excitations. Here we propose a heterostructure that interfaces altermagnetic monolayer V2Se2O with a conventional s-wave superconductor. Starting from an ab-initio description of V2Se2O, we construct a low-energy model of its spin-split Fermi surface and study the superconducting instability of the coupled stack. We find that the momentum-dependent exchange splitting of the altermagnet strongly favors equal-spin pairing and converts the proximity-induced order into a fully gapped p-wave state. Over a broad range of interface parameters, the resulting Bogoliubov-de Gennes bands carry a nonzero Chern number, and slab spectra exhibit chiral Majorana edge modes traversing the bulk gap. We further quantify the inverse proximity effect and show how the induced gap evolves across a finite multilayer stack. These results establish a route to topological triplet superconductivity by interfacing a conventional superconductor with an experimentally available altermagnetic semiconductor, and provide practical guidance for interface fabrication and experimental detection.
Related
- Topological Superconducting Phases in a Strained Altermagnet-Superconductor Heterostructure
- Majorana corner modes and tunable braiding in an altermagnet-superconductor heterostructure
- Twist-Tunable Paramagnetic Superconductivity in d-wave Altermagnet/Superconductor Heterostructures
- Equal-Spin local and nonlocal Andreev reflection in altermagnet/superconductor/altermagnet junction
- Symmetry-selective field-induced triplet superconductivity in Ising-superconductor monolayer NbSe2
BibTeX
@misc{liudeng2026topological,
title = {{Topological superconductivity in an altermagnet-superconductor heterostructure}},
author = {Michael Liudeng and Hrishikesh Patel and Marcel Franz and Niclas Heinsdorf},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.13408},
eprint = {2609.13408},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.13408},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Topological superconductivity in an altermagnet-superconductor heterostructure
AU - Michael Liudeng
AU - Hrishikesh Patel
AU - Marcel Franz
AU - Niclas Heinsdorf
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.13408
UR - https://arxiv.org/abs/2609.13408
AB - Fully gapped spin-triplet superconductors offer a natural setting for topological edge transport and Majorana excitations. Here we propose a heterostructure that interfaces altermagnetic monolayer V_2Se_2O with a conventional s-wave superconductor. Starting from an ab-initio description of V_2Se_2O, we construct a low-energy model of its spin-split Fermi surface and study the superconducting instability of the coupled stack. We find that the momentum-dependent exchange splitting of the altermagnet strongly favors equal-spin pairing and converts the proximity-induced order into a fully gapped p-wave state. Over a broad range of interface parameters, the resulting Bogoliubov-de Gennes bands carry a nonzero Chern number, and slab spectra exhibit chiral Majorana edge modes traversing the bulk gap. We further quantify the inverse proximity effect and show how the induced gap evolves across a finite multilayer stack. These results establish a route to topological triplet superconductivity by interfacing a conventional superconductor with an experimentally available altermagnetic semiconductor, and provide practical guidance for interface fabrication and experimental detection.
ER -