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arXiv · 1407.4915

Proximity nanovalve with large phase-tunable thermal conductance

E. Strambini·F. S. Bergeret·F. Giazotto
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Abstract

We propose a phase-controlled heat-flux quantum valve based on the proximity effect driven by a superconducting quantum interference proximity transistor (SQUIPT). Its operation relies on the phase-dependent quasiparticle density of states in the Josephson weak-link of the SQUIPT which controls thermal transport across the device. In a realistic Al/Cu-based setup the structure can provide efficient control of thermal current inducing temperature swings exceeding $\sim100$~mK, and flux-to-temperature transfer coefficients up to $\sim 500$~mK/$Φ_0$ below 100~mK. The nanovalve performances improve by lowering the bath temperature, making the proposed structure a promising building-block for the implementation of coherent caloritronic devices operating below 1~K.

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E. Strambini, F. S. Bergeret, F. Giazotto. 2014-07-18. Proximity nanovalve with large phase-tunable thermal conductance. https://doi.org/10.1063/1.4893759

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