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Electronic heat current rectification in hybrid superconducting devices
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48. Energy-balance equations for the reverse configuration can be easily obtained by replacing J2,fw⇒J2,rev, Jfw⇒Jrev, J3,out⇒J1,out, T2,fw⇒T2,rev and Tfw⇒Trev.
49. In the case of chain diodes, is defined as the rectification efficiency corresponding to the maximum value between and at a given Tbath.
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In this work, we review and expand recent theoretical proposals for the realization of electronic thermal diodes based on tunnel-junctions of normal metal and superconducting thin films. Starting from the basic rectifying properties of a single hybrid tunnel junction, we will show how the rectification efficiency can be largely increased by combining multiple junctions in an asymmetric chain of tunnel-coupled islands. We propose three different designs, analyzing their performance and their potential advantages. Besides being relevant from a fundamental physics point of view, this kind of devices might find important technological application as fundamental building blocks in solid-state thermal nanocircuits and in general-purpose cryogenic electronic applications requiring energy management.
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