Effect of gas flow on electronic transport in a DNA-decorated carbon nanotube.

We calculate the two-time current correlation function using the experimental data of the current-time characteristics of the Gas-DNA-decorated carbon nanotube field effect transistor. The pattern of the correlation function is a measure of the sensitivity and selectivity of the sensors and suggest that these gas flow sensors may also be used as DNA sequence detectors. The system is modelled by a one-dimensional tight-binding Hamiltonian and we present analytical calculations of quantum electronic transport for the system using the time-dependent nonequilibrium Green's function formalism and the adiabatic expansion. The zeroth and first order contributions to the current I(0)(t) and I(1)(t) are calculated, where I(0)(t) is the Landauer formula. The formula for the time-dependent current is then used to compare the theoretical results with the experiment.