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

Antti Ranni; Elsa T. Mannila; Axel Eriksson; Dmitry S. Golubev; Jukka P. Pekola; Ville F. Maisi

doi:10.1103/PhysRevLett.129.207703

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

Antti Ranni, Elsa T. Mannila, Axel Eriksson, Dmitry S. Golubev, Jukka P. Pekola, Ville F. Maisi

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Abstract

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.

Original language	English
Article number	207703
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review Letters
Volume	129
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.129.207703
Publication status	Published - 11 Nov 2022
MoE publication type	A1 Journal article-refereed

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title = "Local and Nonlocal Two-Electron Tunneling Processes in a Cooper Pair Splitter",

abstract = "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.",

author = "Antti Ranni and Mannila, {Elsa T.} and Axel Eriksson and Golubev, {Dmitry S.} and Pekola, {Jukka P.} and Maisi, {Ville F.}",

note = "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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AU - Ranni, Antti

AU - Mannila, Elsa T.

AU - Eriksson, Axel

AU - Golubev, Dmitry S.

AU - Pekola, Jukka P.

AU - Maisi, Ville F.

N1 - 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.

PY - 2022/11/11

Y1 - 2022/11/11

N2 - 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.

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

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