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We have investigated a double-island single-electron transistor (DISET)coupled to a floating metal double-dot (DD). Low-temperature transportmeasurements were used to map out the charge configurations of both the DISETand the DD. A suppression of the current through the DISET was observedwhenever the charge configurations of the DISET and the DD were energeticallyco-degenerate. This effect was used to distinguish between degenerate andnon-degenerate charge configurations of the double-dot. We also show that thisdetection scheme reduces the susceptibility of the DISET to interference fromrandom charge noise.Comment: 3 pages, 3 figures, to appear in Appl. Phys. Let

Current suppression in a double-island single-electron transistor for detection of degenerate charge configurations of a floating double-dot