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Manipulating electron-spin polarization using cysteine-DNA chiral conjugates.

Chittatosh Pal1, Subrata Majumder1

  • 1Department of Physics, National Institute of Technology, Patna 800005, India.

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Chiral molecules in deoxyribonucleic acid (DNA) functionalized with cysteine enabled controlled electron spin transmission. This research advances spin-dependent charge transport and applications.

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Area of Science:

  • Molecular electronics
  • Spintronics
  • Biophysics

Background:

  • Chiral molecules possess inherent asymmetric helical electric fields, making them promising for spin-filtering applications.
  • Controlling electron spin is crucial for developing advanced electronic devices and quantum technologies.

Purpose of the Study:

  • To investigate the spin-selective transmission of electrons through deoxyribonucleic acid (DNA) functionalized with enantiomeric cysteine molecules.
  • To explore the potential of chiral molecules as generators of spin-filters using quantum mechanical tunneling.

Main Methods:

  • Fabrication of self-assembled monolayers of 15 base-paired double-stranded DNA on gold substrates.
  • Functionalization of DNA with dextro-cysteine and levo-cysteine enantiomers.
  • Measurement of electron spin polarization using quantum mechanical tunneling at room temperature.

Main Results:

  • Observed a controlled spin polarization of 33% with dextro-cysteine functionalized DNA.
  • Observed a spin polarization of 8% with levo-cysteine functionalized DNA.
  • Demonstrated spin-selective electron transmission influenced by molecular chirality.

Conclusions:

  • Chiral cysteine-functionalized DNA can act as effective spin-filters.
  • Molecular chirality offers a pathway for manipulating electron spin, paving the way for advancements in spintronics.
  • This work highlights the potential of small chiral molecules in spin-dependent charge transport phenomena and related applications.