COMBINED BLOCH AND SINGLE-ELECTRON-TUNNELING OSCILLATIONS IN ONE-DIMENSIONAL ARRAYS OF SMALL TUNNEL JUNCTIONS
1994
It is shown that at sufficiently low temperatures, one-dimensional arrays of ultrasmall tunnel junctions (for example, semiconductor superlattices) may exhibit an unusual type of electron transfer. This process can be considered as fast ``Bloch'' oscillations with frequency ${\mathit{f}}_{\mathit{B}}$=\ensuremath{\varepsilon}/h (where \ensuremath{\varepsilon} is the electron energy change due to tunneling through one tunnel barrier), modulated with lower single-electron-tunneling frequency ${\mathit{f}}_{\mathit{S}}$=I/e (where I is the dc electric current through the array).
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