Vortex-mediated spin current injection into two-dimensional superconductor NbSe2

Abstract

Injection of pure spin current into superconductors remains a major challenge in superconducting spintronics. Previous studies have primarily focused on spin-polarized quasiparticles and spin-triplet supercurrents, while vortices, ubiquitous topological defects in type-2 superconductors, have been theoretically proposed as alternative carriers of spin angular momentum, yet direct experimental evidence is still lacking. Here, we report the vortex-mediated spin current injection in NbSe2/LiAl2Fe3O8(LAFO) bilayer, an Ising superconductor/ferrimagnetic insulator heterostructure. Under an out-of-plane temperature gradient and an in-plane magnetic field, the NbSe2/LAFO bilayer shows a pronounced thermoelectric peak near the upper critical magnetic field, which has the opposite sign to the conventional vortex Nernst signal observed in a single-layer NbSe2. The sign reversal suggests that the vortex flow induced by spin current injection is opposite to the flow driven by the temperature gradient, which is consistent with theoretical mechanisms including spin-vorticity transmutation and the inverse vortex spin Hall effect. By mapping the field temperature phase diagram, we reveal that the spin current injection occurs exclusively in the vortex liquid phase of NbSe2. Absence of the thermoelectric signal above the superconducting transition temperature further rules out the quasiparticle contribution. Our results establish vortices as efficient carriers of spin information in superconductors, opening a new route towards vortex-mediated superconducting spintronic devices.

Vortex-mediated spin current injection into two-dimensional superconductor NbSe ₂
Meng Yang, Xiaolong Yin, Jingjing Liu +7
Science Advances21 Oct 2026Peer-reviewedCC BYFull textCondensed matterCrossrefEurope PMC
Exotic vortex states and enhancement of orbital upper critical fields in an s-wave quasicrystalline superconductor
Takumi Fukushima, Yuki Yamamoto, Nayuta Takemori +3
arXiv21 Oct 2026PreprintarXiv licenceFull textCondensed matterarXiv
Vortex-core Majorana coupling to a chiral edge in a p_x+ip_y superconductor: Nonmonotonic spectral reorganization and coherent fermion-parity dynamics
Peiyao Liu, Yi Zhou
arXiv2 Sep 2026PreprintCC BY 4.0Full textCondensed matterarXiv
Interplay of Chemical Disorder, Vortex Pinning, and Electron Correlations in the Mechanically Robust Medium-Entropy Alloy Superconductor Nb_0.45Ta_0.25Ti_0.15Hf_0.15
Pooja Chourasia, Samiul Sk, Nikita Sharma +6
arXiv23 Oct 2026PreprintCC BY 4.0Full textCondensed matterarXiv
Current - voltage characteristics in magnetic field for layered superconductor with intrinsic pinning of Josephson vortices
T. B. Charikova, V. N. Neverov, M. R. Popov +3
arXiv14 Sep 2026PreprintCC BY-NC-ND 4.0Full textCondensed matterarXiv

Cite

BibTeX RIS

BibTeX

@misc{yang2026vortexmediated,
  title = {{Vortex-mediated spin current injection into two-dimensional superconductor NbSe2}},
  author = {Meng Yang and Xiaolong Yin and Jingjing Liu and Yifeng Chen and Qinwu Gao and Hongxing Zhu and Danni Huang and Lang Chen and Shuo-Ying Yang and Junxue Li},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.19727},
  eprint = {2609.19727},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.19727},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Vortex-mediated spin current injection into two-dimensional superconductor NbSe2
AU  - Meng Yang
AU  - Xiaolong Yin
AU  - Jingjing Liu
AU  - Yifeng Chen
AU  - Qinwu Gao
AU  - Hongxing Zhu
AU  - Danni Huang
AU  - Lang Chen
AU  - Shuo-Ying Yang
AU  - Junxue Li
PY  - 2026
DA  - 2026/09/17
PB  - arXiv
DO  - 10.48550/arxiv.2609.19727
UR  - https://arxiv.org/abs/2609.19727
AB  - Injection of pure spin current into superconductors remains a major challenge in superconducting spintronics. Previous studies have primarily focused on spin-polarized quasiparticles and spin-triplet supercurrents, while vortices, ubiquitous topological defects in type-2 superconductors, have been theoretically proposed as alternative carriers of spin angular momentum, yet direct experimental evidence is still lacking. Here, we report the vortex-mediated spin current injection in NbSe2/LiAl2Fe3O8(LAFO) bilayer, an Ising superconductor/ferrimagnetic insulator heterostructure. Under an out-of-plane temperature gradient and an in-plane magnetic field, the NbSe2/LAFO bilayer shows a pronounced thermoelectric peak near the upper critical magnetic field, which has the opposite sign to the conventional vortex Nernst signal observed in a single-layer NbSe2. The sign reversal suggests that the vortex flow induced by spin current injection is opposite to the flow driven by the temperature gradient, which is consistent with theoretical mechanisms including spin-vorticity transmutation and the inverse vortex spin Hall effect. By mapping the field temperature phase diagram, we reveal that the spin current injection occurs exclusively in the vortex liquid phase of NbSe2. Absence of the thermoelectric signal above the superconducting transition temperature further rules out the quasiparticle contribution. Our results establish vortices as efficient carriers of spin information in superconductors, opening a new route towards vortex-mediated superconducting spintronic devices.
ER  -

Abstract

Related

Cite