Laser-Assisted Conductance of Molecular Wires:Two-Photon Contributions

摘要

We extend to second order in the field intensity a previously obtained first-order expression for the conductance of a tight-binding molecular wire,bridging two electrodes,illuminated by a weak laser.The higher-order term brings in corrections due to two-photon processes that,for low intensities and strong molecule-electrode contacts,are several orders of magnitude smaller than the first-order leading terms.For other ranges of parameters,the second-order correction may be significant mostly due to processes involving the absorption or emission of two photons.