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A device for measuring spin selectivity in electron transfer.

Karuppannan Senthil Kumar1, Nirit Kantor-Uriel, Shinto Pulinthanathu Mathew

  • 1Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel. ron.naaman@weizmann.ac.il.

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Summary

This study introduces a novel device for measuring spin selectivity in molecular charge transfer. The device reveals spin-dependent electron transfer in DNA, varying with length.

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Area of Science:

  • Molecular Electronics
  • Spintronics
  • Biophysics

Background:

  • Charge transfer in adsorbed molecules is crucial for molecular electronics.
  • Understanding spin selectivity in these processes is key to developing spintronic devices.
  • Previous methods lacked direct measurement of spin selectivity in complex biomolecules like DNA.

Purpose of the Study:

  • To present a new device for direct measurement of spin selectivity in molecular charge transfer.
  • To investigate spin-dependent electron transfer through double-stranded DNA.
  • To analyze the influence of DNA oligomer length on spin selectivity.

Main Methods:

  • Development of a novel device monitoring electric potential between ferromagnetic Ni and Ag layers.
  • Self-assembly of double-stranded DNA on a silver substrate under ambient conditions.
  • Photoexcitation of dye molecules attached to DNA to induce charge transfer.

Main Results:

  • The device directly measures spin selectivity in charge transfer processes.
  • Spin-dependent electron transfer through double-stranded DNA was established.
  • The extent of spin selectivity was observed to vary with DNA oligomer length.

Conclusions:

  • The presented device enables direct assessment of spin selectivity in molecular charge transfer.
  • Spin-dependent electron transfer occurs in DNA, influenced by its length.
  • This work opens avenues for spin-controlled charge transport in DNA-based molecular electronics.