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Spin Polarization from Circularly Polarized Light Induced Charge Transfer.

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Chiral light exciting achiral molecules can generate spin polarization via electron transfer. This chirality-induced spin selectivity arises from electronic properties and light polarization.

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Area of Science:

  • Photochemistry
  • Quantum Chemistry
  • Spin Physics

Background:

  • Chirality-induced spin selectivity (CISS) is a phenomenon linking molecular chirality and electron spin.
  • Understanding CISS mechanisms is crucial for developing novel spintronic devices.

Purpose of the Study:

  • To demonstrate spin polarization generation in achiral systems using chiral light.
  • To elucidate the energetic and symmetry requirements for CISS in photoinduced electron transfer.

Main Methods:

  • Quantum mechanical rate theories
  • Numerical simulations
  • Modeling of a metalloporphyrin complex with an axial acceptor ligand

Main Results:

  • Spin polarization generated via photoinduced electron transfer in an achiral donor-acceptor complex.
  • Chirality emerges from electronic degrees of freedom upon excitation with circularly polarized light.
  • Spin polarization is linked to selective excitation of ring currents and depends on spin-orbit coupling.

Conclusions:

  • The study proposes a mechanism for generating spin polarization in achiral molecules using chiral light.
  • The effect is transient and influenced by spin-orbit coupling and Jahn-Teller distortions.
  • Experimental observation is feasible using spin-resolved photoemission spectroscopy.