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Charge fluctuations in a quantum point contact attached to a superconducting lead

Published in Physical review. B, Condensed matter and materials physics. 1999, vol. 60, no. 18, p. R12581 - R12584
Abstract We show how to calculate the charge noise spectrum in a normal mesoscopic conductor, which is capacitively coupled to a macroscopic gate, when this conductor is attached to L normal leads and M superconducting leads, the only restriction being that the superconducting leads must be at the same chemical potential. We then proceed to examine results for a quantum point contact (QPC) in a normal lead connecting to a superconductor. Of interest is the fluctuating current in a gate capacitively coupled to a QPC. The results are compared with the case when all leads are normal. We find a doubling of the equilibrium charge fluctuations and a large enhancement (>2) in the current noise spectrum to first order in \|eV\|, when a channel in the QPC is opening.
Keywords Condensed matter
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MARTIN, Andréw Mccallum, GRAMESPACHER, Thomas, BUTTIKER, Markus. Charge fluctuations in a quantum point contact attached to a superconducting lead. In: Physical Review. B, Condensed Matter, 1999, vol. 60, n° 18, p. R12581 - R12584. doi: 10.1103/PhysRevB.60.R12581 https://archive-ouverte.unige.ch/unige:4227

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Deposited on : 2009-11-30

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