Theory of a double-dot charge detector
arXiv:cond-mat/0602199 · doi:10.1103/PhysRevB.73.235343
Abstract
A double quantum dot charge detector, with one dot Coulomb coupled to the electron to be detected and the other modulated by a time-dependent plunger voltage, is analyzed in a minimal model. The signal and noise of the detector are calculated by a standard master equation and MacDonald formula technique. We find a dip in the noise spectrum at the double Rabi frequency of the double dot, defining the bandwidth available for detecting charges in motion.
5 pages, 3 eps figures, corrected according to published Erratum
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