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Article overview
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Charge fluctuations in a quantum point contact attached to a superconducting lead | Andrew M. Martin
; Thomas Gramespacher
; Markus Buttiker
; | Date: |
16 Jul 1999 | Journal: | Phys. Rev. B 60, R12581 (1999). | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con | 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. | Source: | arXiv, cond-mat/9907240 | Services: | Forum | Review | PDF | Favorites |
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