We present a study of the transport properties of carbon nanotube (CNT) junctions under a time dependent driving such as a laser field. CNT junctions are of essential importance as they might enable a step forward in the way towards molecular computing devices. We concentrate our analysis on symmetric CNT-Y-junctions connected to three armchair CNTs, and calculate the linear conductance by means of the Floquet formalism [1] and Green functions techniques, within a p-orbital description of the carbon network. We present a detailed study of the orientational dependence of the junction relative to the laser field polarization as well as its dependence on the external field frequency W. Our results [2] show the important role of the molecular structure of the Y junction on transport calculations.

[1] J.H. Shirley, Phys. Rev. 138, B979 (1965).
[2] M. del Valle, N. Ranjan and G. Cuniberti, in preparation.