access icon free First principle approach towards logic design using hydrogen-doped single-strand DNA

Molecular logic gate has been proposed using single-strand DNA (ssDNA) consisting of basic four nucleobases. In this study, density functional theory and non-equilibrium Green's function based first principle approach is applied to investigate the electronic transmission characteristics of ssDNA chain. The heavily hydrogen-doped-ssDNA (H-ssDNA) chain is connected with gold electrode to achieve enhanced quantum-ballistic transmission along 〈1 1 1〉 direction. Logic gates OR, Ex-OR, NXOR have been implemented using this analytical model of H-ssDNA device. Enhanced logic properties have been observed for ssDNA after H adsorption due to improved electronic transmission. Dense electron cloud is considered as logic ‘high’ (1) output in presence of hydrogen molecule and on the contrary sparse cloud indicate logic ‘low’ (0) in the absence of hydrogen molecule. Device current is significantly increased from 0.2 nA to 2.4 µA (approx.) when ssDNA chain is heavily doped with hydrogen molecule. The current–voltage characteristics confirm the formation of various Boolean logic gate operations.

Inspec keywords: molecular electronics; Green's function methods; logic circuits; DNA; hydrogen; logic gates; logic design; density functional theory; adsorption

Other keywords: H; analytical model; hydrogen molecule; gold electrode; nonequilibrium Green's function; nucleobases; dense electron cloud; first principle approach; NXOR logic gates; density functional theory; Ex-OR logic gates; Boolean logic gate operations; OR logic gates; contrary sparse cloud; current–voltage characteristics; improved electronic transmission; enhanced logic properties; hydrogen-doped-ssDNA chain; enhanced quantum-ballistic transmission; hydrogen-doped single-strand DNA; H-ssDNA device; molecular logic gate; logic design; electronic transmission characteristics

Subjects: Molecular electronics; Logic and switching circuits; Logic circuits; Mathematical analysis; Mathematical analysis; Logic design methods; Digital circuit design, modelling and testing; Logic elements

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-nbt.2018.5027
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