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.
@article{arxiv.cond-mat/0602199,
title = {Theory of a double-dot charge detector},
author = {Tamas Geszti and Jozsef Zsolt Bernad},
journal= {arXiv preprint arXiv:cond-mat/0602199},
year = {2009}
}
Comments
5 pages, 3 eps figures, corrected according to published Erratum