Browsing by Author "Galda, A."

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    Nonlocal thermoelectricity in a hybrid superconducting graphene device
    (2021-06-16) Golubev, D. S.; Kirsanov, N. S.; Tan, Z. B.; Laitinen, A.; Galda, A.; Vinokur, V. M.; Haque, M.; Savin, A.; Lesovik, G. B.; Hakonen, P. J.; Centre of Excellence in Quantum Technology, QTF; Department of Applied Physics; University of Chicago; OtaNano; Terra Quantum AG; Lesovik, Gordey; Vinokur, Valeril; Perelshtein, Mikhail
    The Seebeck effect producing voltage difference from temperature gradient has a wide spectrum of applications. Recent theoretical studies show that the Cooper pair splitting and the elastic co-tunneling can give rise to the nonlocal Seebeck effect in hybrid normal metal-superconductor-normal metal systems. Here we propose a coherent transport description of this nonlocal effect and validate its experimental observation in a graphene-based Cooper pair splitter.
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    Thermoelectric current in a graphene Cooper pair splitter
    (Nature Publishing Group, 2021-12) Tan, Z. B.; Laitinen, A.; Kirsanov, N. S.; Galda, A.; Vinokur, V. M.; Haque, M.; Savin, A.; Golubev, D. S.; Lesovik, G. B.; Hakonen, P. J.; Department of Applied Physics; Quantum Circuits and Correlations; Centre of Excellence in Quantum Technology, QTF; Quantum Phenomena and Devices; United States Department of Energy; University of Chicago; Moscow Institute of Physics and Technology
    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.