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Sub-diffusive electronic transport in a DNA single-strand chain with electron-phonon coupling.

M O Sales1, M L Lyra, F A B F de Moura

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|January 8, 2015
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Summary

Electronic wavepacket dynamics in DNA are explored, revealing sub-diffusive spread due to electron-phonon coupling. This interaction influences how electrons move along the DNA strand.

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Area of Science:

  • Biophysics
  • Quantum Chemistry
  • Materials Science

Background:

  • Understanding charge transport in DNA is crucial for molecular electronics.
  • Electron-phonon coupling significantly impacts electronic properties in condensed matter systems.

Purpose of the Study:

  • To investigate the dynamics of electronic wavepackets in a finite DNA single-strand segment.
  • To analyze the role of electron-phonon coupling in mediating wavepacket spread.

Main Methods:

  • Utilized an effective tight-binding Hamiltonian for electron dynamics.
  • Employed a classical harmonic Hamiltonian for DNA vibrations.
  • Solved the time-dependent Schrödinger equation numerically using the Dormand-Prince method.

Main Results:

  • Observed a sub-diffusive spreading of the electronic wavepacket.
  • Demonstrated that electron-phonon interaction is the key mediator of this sub-diffusive behavior.

Conclusions:

  • Electron-phonon coupling introduces a sub-diffusive character to electronic wavepacket propagation in DNA.
  • This finding has implications for DNA-based electronic devices and understanding biological charge transfer.