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Tunable Noise Cross-Correlations in a Double Quantum Dot

D. T. McClure, L. DiCarlo, Y. Zhang, H. -A. Engel, C. M. Marcus, M. P. Hanson, A. C. Gossard

cond-mat.mes-hallarXiv:cond-mat/0607280

Abstract

We report measurements of the cross-correlation between current noise fluctuations in two capacitively coupled quantum dots in the Coulomb blockade regime. The sign of the cross-spectral density is found to be tunable by gate voltage and source-drain bias. Good agreement is found with a model of sequential tunneling through the dots in the presence of inter-dot capacitive coupling.

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