Shot-Noise-Limited Operation of a Fast Quantum-Point-Contact Charge Sensor

Simple item page
dc.creatorThalakulam, Madhu
dc.creatorXue, W. W.
dc.creatorPan, Feng
dc.creatorJi, Z.
dc.creatorStettenheim, J.
dc.creatorPfeiffer, Loren
dc.creatorWest, K. W.
dc.creatorRimberg, A. J.
dc.date2007-08-07
dc.date.accessioned2026-07-07T08:22:33Z
dc.date.available2026-07-07T08:22:33Z
dc.descriptionWe 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.
dc.description4 pages, 4 figures, REVTeX 4
dc.identifierhttps://arxiv.org/abs/0708.0861
dc.identifierhttp://arxiv.org/abs/0708.0861
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/135689
dc.subjectMesoscale and Nanoscale Physics
dc.titleShot-Noise-Limited Operation of a Fast Quantum-Point-Contact Charge Sensor
dc.typetext

Files

Collections

arXiv