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uttiker‐type structure which enables the extraction of an effective transmission coefficient for the transport.ExpandingtheFermifunctionintoa seriesofsimplepoles,wefindanexact formalrelationbetween the parameterswhichcharacterizethebiasfluctuationsandthepolesoftheFermifunction.Thisenablesustodescribe the effect of the temperature and the strength of the fluctuations on the averaged current which we interpret as a quantum analog to the classical fluctuation-dissipation theorem. We use these results to convincingly refute some recent results on the multistability of the current through a fluctuating level, simultaneously verifying that our formalismsatisfiessomewell-knowntheoremsontheasymptoticcurrent.Finally,wepresentnumericalresultsfor the current through a molecular chain which demonstrate a transition from nonlinear to linear I-V characteristics as the strength of fluctuations is increased, as well as a stochastic resonance effect in the conductance of this system.

Fluctuating-bias controlled electron transport in molecular junctions