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Role of chirality in the polarizer-filter dichotomy in nonmagnetic junctions

  • Sergei Urazhdin
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Abstract

Chirality-induced spin selectivity can enable spin generation by nonmagnetic junctions, but its symmetry requirements remain debated. We show that the symmetry of the junction constrains its polarizing behavior: a spin polarizer requires a chiral junction, whereas an achiral junction can act as a spin filter. This symmetry involves the junction as a whole, not only the molecule. Achiral molecules can act as polarizers or filters depending on junction geometry, as confirmed with a minimal tight-binding model. Reciprocity forbids polarization detection by linear two-terminal magnetoresistance; we propose a nonlocal measurement that distinguishes polarizers from filters and establishes whether the junction breaks time-reversal symmetry.

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Cite

BibTeXRIS
BibTeX
@misc{urazhdin2026role,
  title = {{Role of chirality in the polarizer-filter dichotomy in nonmagnetic junctions}},
  author = {Sergei Urazhdin},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.24226},
  eprint = {2610.24226},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.24226},
}
RIS
TY  - UNPB
TI  - Role of chirality in the polarizer-filter dichotomy in nonmagnetic junctions
AU  - Sergei Urazhdin
PY  - 2026
DA  - 2026/10/16
PB  - arXiv
DO  - 10.48550/arxiv.2610.24226
UR  - https://arxiv.org/abs/2610.24226
AB  - Chirality-induced spin selectivity can enable spin generation by nonmagnetic junctions, but its symmetry requirements remain debated. We show that the symmetry of the junction constrains its polarizing behavior: a spin polarizer requires a chiral junction, whereas an achiral junction can act as a spin filter. This symmetry involves the junction as a whole, not only the molecule. Achiral molecules can act as polarizers or filters depending on junction geometry, as confirmed with a minimal tight-binding model. Reciprocity forbids polarization detection by linear two-terminal magnetoresistance; we propose a nonlocal measurement that distinguishes polarizers from filters and establishes whether the junction breaks time-reversal symmetry.
ER  -