Abstract
We have theoretically investigated parallel coupled single-electron transistors (SET's) at strong coupling. We have found that the Coulomb diamond of the coupled SET's fragments into subdomains---triangular strips---which can be labeled by the number of electron-hole pairs and whose number increases as the coupling strengthens. The Coulomb blockading electron-hole pairs lead to the appearance of satellite Coulomb blockade oscillations in the expanded insulating region.
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