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PreprintarXiv licencearXiv

Superconducting Diode Effect in Josephson φ0 Junction

  • A. Janalizadeh
  • Y. M. Shukrinov
  • M. R. Kolahchi
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Abstract

We investigate the superconducting diode effect in a Josephson junction with a ferromagnetic weak link in the presence of Rashba spin-orbit coupling. While the standard φ0 junction model is valid only for weak exchange fields h ≲ Tc, realistic ferromagnetic barriers typically operate in the regime h ≫ Tc, where the conventional Ginzburg-Landau gradient expansion becomes insufficient and requires the inclusion of higher order gradient terms to ensure stability of the free energy. By extending the free energy with such higher order term, we demonstrate that the linear gradient coupling alone leads to finite momentum Cooper pairing while leaving the critical current symmetry unchanged. The interplay between this linear term and the higher order gradient one leads to the Josephson diode effect.

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Cite

BibTeXRIS
BibTeX
@misc{janalizadeh2026superconducting,
  title = {{Superconducting Diode Effect in Josephson $φ_0$ Junction}},
  author = {A. Janalizadeh and Y. M. Shukrinov and M. R. Kolahchi},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.13399},
  eprint = {2609.13399},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.13399},
}
RIS
TY  - UNPB
TI  - Superconducting Diode Effect in Josephson φ_0 Junction
AU  - A. Janalizadeh
AU  - Y. M. Shukrinov
AU  - M. R. Kolahchi
PY  - 2026
DA  - 2026/09/11
PB  - arXiv
DO  - 10.48550/arxiv.2609.13399
UR  - https://arxiv.org/abs/2609.13399
AB  - We investigate the superconducting diode effect in a Josephson junction with a ferromagnetic weak link in the presence of Rashba spin-orbit coupling. While the standard φ_0 junction model is valid only for weak exchange fields h ≲ T_c, realistic ferromagnetic barriers typically operate in the regime h ≫ T_c, where the conventional Ginzburg-Landau gradient expansion becomes insufficient and requires the inclusion of higher order gradient terms to ensure stability of the free energy. By extending the free energy with such higher order term, we demonstrate that the linear gradient coupling alone leads to finite momentum Cooper pairing while leaving the critical current symmetry unchanged. The interplay between this linear term and the higher order gradient one leads to the Josephson diode effect.
ER  -