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Spin filtering through circular DNA molecular junctions: External field vs chirality.

Sheng'ao Zhang1, Feng Jiang1, Yonghong Yan2

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Researchers explored the Chiral-Induced Spin Selectivity effect in helical chains using a spin-orbit interaction model. They discovered unique spin-filtering Aharonov-Bohm effects in circular DNA, influenced by electric fields and chirality.

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Area of Science:

  • Condensed Matter Physics
  • Molecular Biophysics
  • Quantum Chemistry

Background:

  • Chiral molecules can exhibit spin-selective properties.
  • Understanding spin selectivity in helical structures like DNA is crucial for molecular electronics.

Purpose of the Study:

  • To develop a theoretical model for Chiral-Induced Spin Selectivity (CISSE) in helical molecular chains.
  • To investigate spin filtering phenomena in circular DNA molecular junctions.

Main Methods:

  • Developed a spin-orbit interaction model in second-quantized form.
  • Applied non-equilibrium Green's function theory.
  • Studied spin transport through circular DNA.

Main Results:

  • Identified a general spin-dependent sideband resonance structure in conductance.
  • Demonstrated a unique spin-filtering Aharonov-Bohm effect in non-magnetic systems using circular DNA.
  • Revealed relationships between spin polarization, external fields, and chirality.

Conclusions:

  • The study provides an in-depth understanding of CISSE in helical systems.
  • A critical transverse electric field significantly modulates the spin-filtering Aharonov-Bohm effect.
  • Circular DNA serves as a promising platform for exploring spin-related quantum phenomena.