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

Contributors

Martin, Andréw Mccallum; Gramespacher, Thomas; Buttiker, Markus

Published in

Physical review. B, Condensed matter and materials physics, vol. 60, no. 18, p. R12581-R12584

Publication date

1999

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

UNIGE affiliation entities

Citation (ISO format)

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 and materials physics, 1999, vol. 60, n° 18, p. R12581–R12584. doi: 10.1103/PhysRevB.60.R12581

Main files (1)

Article

Identifiers

Journal ISSN

1098-0121
618views
383downloads

Technical informations

Creation

30/11/2009 15:07:37

First validation

30/11/2009 15:07:37

Update

14/03/2023 15:18:06

Status update

14/03/2023 15:18:06

Last indexation

29/10/2024 12:37:13
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