Volume 118, Number 6, June 2017
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||04 September 2017|
Phase-tunable temperature amplifier
1 NEST, Instituto Nanoscienze-CNR and Scuola Normale Superiore - I-56127 Pisa, Italy
2 Dipartimento di Fisica dell'Università di Pisa - Largo Pontecorvo 3, I-56127 Pisa, Italy
Received: 24 May 2017
Accepted: 10 August 2017
Coherent caloritronics, the thermal counterpart of coherent electronics, has drawn growing attention since the discovery of heat interference in 2012. Thermal interferometers, diodes, transistors and nano-valves have been theoretically proposed and experimentally demonstrated by exploiting the quantum phase difference between two superconductors coupled through a Josephson junction. So far, the quantum-phase modulator has been realized in the form of a superconducting quantum interference device (SQUID) or a superconducting quantum interference proximity transistor (SQUIPT). Thence, an external magnetic field is necessary in order to manipulate the heat transport. Here, we theoretically propose the first on-chip fully thermal caloritronic device: the phase-tunable temperature amplifier (PTA). Taking advantage of a recently discovered thermoelectric effect in spin-split superconductors coupled to a spin-polarized system, we generate the magnetic flux controlling the transport through a temperature-biased SQUIPT by applying a temperature gradient. We simulate the behavior of the device and define a number of figures of merit in full analogy with voltage amplifiers. Notably, our architecture ensures almost infinite input thermal impedance, maximum gain of about 11 and efficiency reaching the 95%. This concept paves the way for applications in radiation sensing, thermal logics and quantum information.
PACS: 85.25.Cp – Josephson devices / 74.25.Bt – Thermodynamic properties / 85.80.Fi – Thermoelectric devices
© EPLA, 2017
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