Thermoelectric current in a graphene Cooper pair splitter

Z. B. Tan, A. Laitinen, N. S. Kirsanov, A. Galda, V. M. Vinokur, M. Haque, A. Savin, D. S. Golubev, G. B. Lesovik and P. J. Hakonen ()
Additional contact information
Z. B. Tan: Aalto University
A. Laitinen: Aalto University
N. S. Kirsanov: Aalto University
A. Galda: University of Chicago
V. M. Vinokur: University of Chicago
M. Haque: Aalto University
A. Savin: Aalto University
D. S. Golubev: Aalto University
G. B. Lesovik: Terra Quantum AG
P. J. Hakonen: Aalto University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Generation of electric voltage in a conductor by applying a temperature gradient is a fundamental phenomenon called the Seebeck effect. This effect and its inverse is widely exploited in diverse applications ranging from thermoelectric power generators to temperature sensing. Recently, a possibility of thermoelectricity arising from the interplay of the non-local Cooper pair splitting and the elastic co-tunneling in the hybrid normal metal-superconductor-normal metal structures was predicted. Here, we report the observation of the non-local Seebeck effect in a graphene-based Cooper pair splitting device comprising two quantum dots connected to an aluminum superconductor and present a theoretical description of this phenomenon. The observed non-local Seebeck effect offers an efficient tool for producing entangled electrons.

Date: 2021
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DOI: 10.1038/s41467-020-20476-7

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