Nonlinear electron transport across short DNA segment between graphene leads

The current-voltage curves of a double strand DNA nanowire connected to armchair graphene nanoribbon leads are investigated using the tight-binding Hamiltonian model and the Landauer-Büttiker formalism. The nonlinear behavior of the current-voltage for different lengths of the DNA nanowire is calculated and interpreted through the corresponding density of states and transmission probability. The behavior of the current-voltage changes as the temperature or width of the leads varies and is also affected by the randomization of parallel and perpendicular hopping terms in the DNA. Around zero bias of the leads, the current-voltage depends on the dimerization effects of parallel hopping in the device.