Direct observation of time correlated single-electron tunneling

Details Direct observation of time correlated single-electron tunneling Direct observation of time correlated single-electron tunneling

2005-08-29

arxiv.org/abs/cond-mat/0508678v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

2 pages, 1 figure; submitted to the 10th International Superconductive Electronics Conference (ISEC'05), the Netherlands, Sept

Scientific paper

We report a direct detection of time correlated single-electron tunneling oscillations in a series array of small tunnel junctions. Here the current, I, is made up of a lattice of charge solitons moving throughout the array by time correlated tunneling with the frequency f=I/e, where e is the electron charge. To detect the single charges, we have integrated the array with a radio-frequency single-electron transistor (RF-SET) and employed two different methods to couple the array to the SET input: by direct injection through a tunnel junction, and by capacitive coupling. In this paper we report the results from the latter type of charge input, where we have observed the oscillations in the frequency domain and measured currents from 50 to 250 fA by means of electron counting.

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