Local and Nonlocal Two-Electron Tunneling Processes in a Cooper Pair Splitter

We measure the rates and coupling coefficients for local Andreev, nonlocal Andreev, and elastic cotunneling processes. The nonlocal Andreev process, giving rise to Cooper pair splitting, exhibits the same coupling coefficient as the elastic cotunneling whereas the local Andreev process is more than 2 orders of magnitude stronger than the corresponding nonlocal one. Theory estimates describe the findings and explain the large difference in the nonlocal and local coupling arising from competition between electron diffusion in the superconductor and tunnel junction transparency.

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Funding Information: We acknowledge Fredrik Brange, Christian Flindt, Martin Leijnse, and Claes Thelander for fruitful discussions and the QuantERA project “2D hybrid materials as a platform for topological quantum computing,” Swedish National Science Foundation (Dnr 2018-00099 and 2019-04111), NanoLund, Academy of Finland Grant No. 312057 and QTF Centre of Excellence for financial support. We acknowledge the provision of facilities by Aalto University at OtaNano—Micronova Nanofabrication Centre.

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10.1103/PhysRevLett.129.207703

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Ranni, A, Mannila, E T, Eriksson, A, Golubev, D S, Pekola, J P & Maisi, V F 2022, ' Local and Nonlocal Two-Electron Tunneling Processes in a Cooper Pair Splitter ', Physical Review Letters, vol. 129, no. 20, 207703, pp. 1-6 . https://doi.org/10.1103/PhysRevLett.129.207703

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https://urn.fi/URN:NBN:fi:aalto-202211306670

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[article-cris] Perustieteiden korkeakoulu / SCI

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Local and Nonlocal Two-Electron Tunneling Processes in a Cooper Pair Splitter

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