Chirality dependence of the tunneling current in graphene nano-gaps for peptide sequencing

Single-molecule techniques for biomolecules sequencing and recognition are of crucial importance for fundamental biology and biomedical applications. On this basis, a newly developed nano-device consisting of a matrix of nano-gaps between graphene nano-ribbons is proposed as a possible route for the atomic resolution peptide sequencing approach. In general, the tunneling current measured between the two leads depends on the chirality of the graphene nano-ribbons employed. In this preliminary study some features concerning this aspect for zig-zag nano-ribbons are evidenced and discussed.