Electrical Noise in Mesoscopic Normal Metal—Insulator—Superconductor Structures

I. V. Boylo

Donetsk Institute for Physics and Engineering Named after O.O. Galkin, NAS of Ukraine, 46 Nauky Ave., UA-03028 Kyiv, Ukraine

Received: 31.10.2014; final version - 11.12.2014. Download: PDF

Numerical calculations of the electrical-noise power in mesoscopic normal metal—insulator—superconductor structures are performed. The influence of temperature on the value of current fluctuations in a tunnel junction is studied. As shown, the voltage dependence of the noise spectral density in the low-frequency limit has two maxima. The first one corresponds to the energy gap of the superconductor and reflects the behaviour of the tunnel-junction conductance, whereas the second one appears at higher voltages as a result of superposition of the thermal and shot noises.

Key words: thermal and shot noise, spectral density of noise, tunnel contact, superconductors.

URL: http://mfint.imp.kiev.ua/en/abstract/v37/i06/0723.html

DOI: https://doi.org/10.15407/mfint.37.06.0723

PACS: 07.50.Hp, 72.70.+m, 73.23.-b, 73.40.Rw, 74.25.fc, 74.45.+c, 74.78.Fk

Citation: I. V. Boylo, Electrical Noise in Mesoscopic Normal Metal—Insulator—Superconductor Structures, Metallofiz. Noveishie Tekhnol., 37, No. 6: 723—730 (2015) (in Russian)

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