Researchers Discover Theoretical Framework for Tuning Spin-Charge Conversion in Topological Thin Films

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In a breakthrough study published in the journal Results in Physics, a team of researchers from the University of Zanjan has made significant advancements in understanding current-induced spin polarization in disordered topological insulator thin films. The research, led by Maryam Heydari, Hanieh Moghaddasi, Mir Vahid Hosseini, and Mehdi Askari, investigated how the properties of these materials can be controlled to enhance spin response and polarization. The team's findings have crucial implications for the development of spintronic devices.

Key Takeaways:

  • The researchers employed the Kubo formalism within the self-consistent Born approximation and incorporated vertex corrections to analyze the effects of disorder, chemical potential, and momentum-dependent hybridization on the spin susceptibility.
  • The study revealed that the spin susceptibility exhibits nonzero values within a finite range around a zero gap, which broadens as the chemical potential increases.
  • The results showed that a higher hybridization strength induces asymmetry in the spin response, and a stronger potential difference significantly enhances polarization.
  • The team's findings provide a theoretical framework for tuning spin-charge conversion in topological thin films, with potential applications in spintronic device development.

Statistics:

  • The study was published in the journal Results in Physics, a leading publication in the field of physics.
  • The research was conducted by a team of researchers from the University of Zanjan, led by Maryam Heydari, Hanieh Moghaddasi, Mir Vahid Hosseini, and Mehdi Askari.
  • The study was supported by the University of Zanjan's Department of Physics and the Faculty of Science.
  • The research has implications for the development of spintronic devices, which could potentially lead to significant advancements in fields such as electronics, computing, and energy storage.

Sources:

  • NewsRx. University of Zanjan Researchers Discuss Research in Physics (Promoted current-induced spin polarization in inversion symmetry broken topological insulator thin films). Physics Week. October 21, 2025; p 834.
  • Heydari, M., et al. "Promoted current-induced spin polarization in inversion symmetry broken topological insulator thin films." Results in Physics, 2025, 77():108445.