Expounding Transport Properties of Deoxyribonucleic Acid for Electronic Applications

Abstract

The scientific interest in field of molecular electronics has raised many folds in last decade to become the centre stage of contemporary research. The community of researchers working in this domain has been continuously exploring newer molecules, which can replace semiconductors of last century and still continue with the same growth. In this research communiqué, we have implemented molecular junctions using NEGF-EHT approach to elucidate the electronic transport properties of two important strands Adenine and Cytosine of Deoxyribonucleic Acid (DNA) sandwiched between with two Au leads under finite bias conditions. Important revelation include non-linear behaviour exhibited with exponential current rise around zero bias due to kondo assisted resonant tunnelling and temperature invariance over a large range of temperature. G–V graph divulges that conductance of the adenine decrease linearly with the increase in bias voltage initially and then becomes dormant for further increase in bias voltage. Contrary to this, the conductance of cytosine is observed to be equal to quantum of conductance (G0) that unambiguously indicates the metallic behaviour of cytosine. The vital information collected through this research work provides vital insight for developing applications as sensors, switches and memory devices.