Collective response to alternating current in the organic conductor α-(bis(ethylenedithio)tetrathiafulvalene)2I3

Abstract

Interference phenomena between dc fields and ac currents are investigated in the two-dimensional charge-ordered organic conductor α-(bis(ethylenedithio)tetrathiafulvalene)2I3. When alternating current is applied together with a dc electric field, steps analogous to Shapiro steps in the ac Josephson effect appear in the voltage-current characteristics at the internal frequency, where the step height follows the first-order Bessel function of the ac field. These results are discussed through an analogy with sliding charge-density waves.