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arXiv:0810.2406 [cond-mat.mes-hall]AbstractReferencesReviewsResources

Time-resolved charge detection with cross-correlation techniques

B. Küng, O. Pfäffli, S. Gustavsson, T. Ihn, K. Ensslin, M. Reinwald, W. Wegscheider

Published 2008-10-14, updated 2009-02-27Version 2

We present time-resolved charge sensing measurements on a GaAs double quantum dot with two proximal quantum point contact (QPC) detectors. The QPC currents are analyzed with cross-correlation techniques, which enables us to measure dot charging and discharging rates for significantly smaller signal-to-noise ratios than required for charge detection with a single QPC. This allows to reduce the current level in the detector and therefore the invasiveness of the detection process and may help to increase the available measurement bandwidth in noise-limited setups.

Comments: 6 pages, 4 figures
Journal: Phys. Rev. B 79, 035314 (2009)
Categories: cond-mat.mes-hall
Subjects: 73.23.Hk, 73.40.Gk
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