Research Reveals New Insights into Chiral Materials' Spin Filtering Effect

Strategic Insights -

A recent study published in Communications Physics has delved into the phenomenon of chiral materials exhibiting a spin filtering effect, known as chirality-induced spin selectivity (CISS). The research, conducted by a team of researchers at Kyoto University, sheds light on how parity mixing in the superconducting order parameter influences spin transport in crystals without inversion symmetry, particularly those with chiral structures. The study's findings provide valuable insights into the properties of superconductivity and the CISS effect in superconductors.

Key Takeaways:

  • The researchers observed a spin filtering effect in chiral materials, which is attributed to the admixture of the spin-singlet and spin-triplet order parameters.
  • The study found that the spin current in weakly parity-mixed superconductors is carried by spin-polarized Cooper pairs with finite center-of-mass momentum, while in strongly parity-mixed superconductors, the temperature-dependent spin current is also carried by electrons with opposite momentum and antiparallel spins forming a Cooper pair.
  • The research concluded that parity mixing in the superconducting order parameter significantly influences spin transport in crystals without inversion symmetry, notably those with chiral structures.
  • The study's results provide a new pathway for studying the CISS effect in superconductors, which has implications for understanding the properties of superconductivity.
  • The research was supported by Mext and the Japan Society For The Promotion of Science.

Statistics:

  • The study was published in Communications Physics, a journal that is part of the Nature Portfolio.
  • The article is available online at https://doi.org/10.1038/s42005-025-02295-8.
  • The research was conducted by a team of researchers at Kyoto University, including Keito Hara and Youichi Yanase.
  • The study investigated the properties of superconductivity and CISS effect in superconductors, with a focus on weakly parity-mixed and strongly parity-mixed superconductors.
  • The research provided new insights into the phenomenon of CISS in superconductors.

Sources:

  • NewsRx. Study Findings on Physics Described by Researchers at Kyoto University (Spin supercurrent in parity-mixed superconductors with structural chirality). Medical Devices & Surgical Technology Week. October 26, 2025; p 2273.
  • Communications Physics. "Spin supercurrent in parity-mixed superconductors with structural chirality." Communications Physics, 2025,8(1):1-10. (Communications Physics - http://www.nature.com/commsphys).
  • Kyoto University. (2025). Spin supercurrent in parity-mixed superconductors with structural chirality. Communications Physics, 8(1), 1-10.