SINIS turnstile for quantum current standards

Nakamura, Shuji and Pashkin, Yuri A. and Tsai, Jaw Shen and Kaneko, Nobu Hisa (2014) SINIS turnstile for quantum current standards. In: CPEM 2014 - 29th Conference on Precision Electromagnetic Measurements, Digest. CPEM Digest (Conference on Precision Electromagnetic Measurements) . Institute of Electrical and Electronics Engineers Inc., BRA, pp. 660-661. ISBN 9781479952052

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Single electron pumping by a SINIS turnstile is investigated up to 1 GHz in various conditions to realize a quantum current standard. A standard deviation of the pumping current at 100 MHz is about 10-4 at base temperature of a dilution refrigerator. As expected, the plateau of the pumped current degrades as temperature increases because of the thermal smearing of Fermi energy of a normal metal island. On the other hand, an externally applied magnetic fields dramatically suppresses excess current on the single electron pumping plateau. This originates from the quasiparticle relaxation enhancement due to the penetration of the magnetic vortices into the superconducting leads.

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22 Jun 2019 01:00
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21 Nov 2022 16:55