Spin-dependent electron transport in protein-like single-helical molecules

Area of Science:

• Condensed Matter Physics
• Biophysics
• Materials Science

Background:

• Electron transport through helical molecules is crucial for spintronics.
• Experimental observations show significant spin-selective phenomena in biomolecules.
• Contradictory results exist between alpha-helical proteins and single-stranded DNA regarding spin transport.

Purpose of the Study:

• To theoretically investigate spin-dependent electron transport in single-helical molecules.
• To explain the observed spin-selective phenomenon in alpha-helical proteins.
• To reconcile discrepancies in spin transport results between proteins and DNA.

Main Methods:

• Theoretical study of spin-dependent electron transport.
• Modeling of single-helical molecules connected to nonmagnetic electrodes.
• Analysis of spin polarization robustness against disorder.

Main Results:

• Alpha-helical proteins function as efficient spin filters.
• Spin polarization in these proteins is robust against disorder.
• Theoretical findings align with recent experimental data.

Conclusions:

• Alpha-helical proteins are promising for spintronic applications.
• The robust spin polarization facilitates the engineering of chiral-based spintronic devices.
• Understanding spin transport in biomolecules opens new avenues in molecular electronics.