2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/29680The DC current-voltage characteristics, induced by a driving electric field with frequency Omega, of a one dimensional electron channel with a tunnel barrier is calculated. Electron-electron interaction of finite-range is taken into account. For intermediate interaction strengths, the non-linear differential conductance shows cusp-like minima at bias voltages integer multiples of hbar Omega / e that are a consequence of the finite non-zero range of the interaction but are independent of the shape of the driving electric field. However, the frequency-scaling of the photo-induced current shows a cross-over between Omega^{-1} and Omega^{-2}, and depends on the spatial shape of the driving field and the range of the interaction.7 pages, EURO-TeX, 3 figures, to appear in Europhysics LettersMesoscale and Nanoscale PhysicsStrongly Correlated Electronstext