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The electron tunneling through a molecular junction modeled by a single siteweakly coupled to two leads is studied in the presence of a time-dependentexternal field using a master equation approach. In the case of small biasvoltages and high carrier frequencies of the external field, we observe thephenomenon of coherent destruction of tunneling, i.e. the current through themolecular junction vanishes completely for certain parameters of the externalfield. In previous studies the tunneling within isolated and open multi-sitesystems was suppressed; it is shown here that the tunneling between a singlesite and electronic reservoirs, i.e. the leads, can be suppressed as well. Forlarger bias voltages the current does not vanish any more since furthertunneling channels participate in the electron conduction and we also observephoton-assisted tunneling which leads to steps in the current-voltagecharacteristics. The described phenomena are demonstrated not only formonochromatic fields but also for laser pulses and therefore could be used forultrafast optical switching of the current through molecular junctions.

Coherent laser control of the current through molecular junctions