Abstract
Statics and dynamics of two-dimensional (2-D) arrays of ultrasmall tunnel junctions is analyzed in terms of creation and motion of topological solitons with electric charges ±e. The solitons tend to form a 2-D Wigner crystal which, on certain conditions, can be driven along the array by external electric field without melting. This drift induces narrow-band “SET” oscillations of frequency f=I/e (where I is the dc current) similar to those observed recently in 1-D arrays.
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