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Giant Spin Splitting in Chiral Perovskites Based on Local Electrical Field Engineering.

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Researchers explored spin properties in chiral hybrid organic-inorganic perovskites (chiral HOIPs). Halogen substitution in chiral molecules significantly boosted spin splitting, paving the way for advanced spintronic materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Chemistry

Background:

  • Chiral hybrid organic-inorganic perovskites (chiral HOIPs) exhibit promising spintronic and spin-optoelectronic properties.
  • Theoretical investigations into the spin physics of chiral HOIPs remain limited.

Purpose of the Study:

  • To theoretically investigate the spin characteristics of Pb-I based chiral HOIPs.
  • To propose and evaluate a molecular engineering strategy for enhancing spin splitting in chiral HOIPs.

Main Methods:

  • First-principles calculations were employed to study spin properties.
  • A k·p model Hamiltonian, informed by symmetry arguments, was utilized.
  • The impact of halogen substitution on molecular electrostatic potential was analyzed.

Main Results:

  • Spin splitting in chiral HOIPs was significantly enhanced by halogen substitution.
  • Spin splitting increased from 13 meV to 73, 90, and 105 meV with F, Cl, and Br substitution, respectively.
  • Halogen substitution was found to strengthen the local electric field and distort the PbI6 octahedron.

Conclusions:

  • Molecular engineering via halogen substitution offers an effective route to tune spin splitting in chiral HOIPs.
  • This approach provides insights for designing novel spintronic materials.