Quantum interference in DNA bases probed by graphene nanoribbons
2013
Based on first-principles nonequilibrium Green's function calculations, we demonstrate quantum interference (QI) effects on the tunneling conductance of deoxyribonucleic acid bases placed between zigzag graphene nanoribbon electrodes. With the analogy of QI in hydrocarbon ring structures, we hypothesize that QI can be well preserved in the π-π coupling between the carbon-based electrode and a single DNA base. We demonstrate indications of QI, such as destructively interfered anti-resonance or Fano-resonance, that affect the variation of tunneling conductance depending on the orientation of a base. We find that guanine, with a 10-fold higher transverse conductance, can be singled out from the other bases.
Keywords:
- Graphene
- Interference (wave propagation)
- Graphene nanoribbons
- Conductance
- Computational chemistry
- Analytical chemistry
- Quantum tunnelling
- Electrical resistivity and conductivity
- Analogy
- Nucleobase
- Molecular physics
- Chemistry
- Zigzag
- Ab initio quantum chemistry methods
- Condensed matter physics
- Nanopore
- Chemical physics
- Physics
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