Periodicity in Al/Ti superconducting single electron transistors

MacLeod, Sarah J. and Kafanov, Sergey and Pekola, Jukka P. (2009) Periodicity in Al/Ti superconducting single electron transistors. Applied Physics Letters, 95 (5). ISSN 0003-6951

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We present experiments on single Cooper-pair transistors made of two different superconducting materials. We chose Ti and Al to create an energy gap profile such that the island has a higher gap than the leads, thereby acting as a barrier to quasiparticle tunneling. Our transport measurements demonstrate that quasiparticle poisoning is suppressed in all our TiAlTi structures (higher gap for the island) with clear 2e periodicity observed, whereas full quasiparticle poisoning is observed in all AlTiAl devices (higher gap for the leads) with e periodicity.

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Applied Physics Letters
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27 Feb 2017 15:08
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22 Nov 2022 04:27