CAPACITIVELY COUPLED 1D-ARRAYS OF SMALL TUNNEL-JUNCTIONS

We have fabricated two nominally identical one-dimensional arrays of s mall tunnel junctions, each with 10 junctions in series. Each electrod e of one array is capacitively coupled to two electrodes in the other array. By measuring the current voltage characteristics of the two arr ays simultaneously, we observe a coupling between the currents in the two arrays. In a narrow region of biasing conditions, we find that the currents are equally large but with opposite signs. We interprete thi s as correlated transport of electrons in one array, and holes in the other array. The experimental results show qualitative agreement with numerical simulations.