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

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.