Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-07
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures, REVTeX 4
Scientific paper
We have operated a quantum point contact (QPC) charge detector in a radio frequency (RF) mode that allows fast charge detection in a bandwidth of tens of megahertz. We find that the charge sensitivity of the RF-QPC is limited not by the noise of a secondary amplifier, but by non-equilibrium noise f the QPC itself. We have performed frequency-resolved measurements of the noise within a 10 MHz bandwidth around our carrier wave. When averaged over our bandwidth, we find that the noise is in good agreement with the theory of photon-assisted shot noise. Our measurements also reveal strong frequency dependence of the noise, asymmetry with respect to the carrier wave, the appearance of sharp local maxima that are correlated with mechanical degrees of freedom in the sample, and noise suppression indicative of many-body physics near the 0.7 structure.
Ji Zhengfeng
Pan Feng
Pfeiffer Loren
Rimberg A. J.
Stettenheim Joel
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