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Phase-controlled superconducting heat-flux quantum modulator
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View: Figures


Image of FIG. 1.
FIG. 1.

Scheme of the proposed device. Two superconductors and kept at temperature and (with ), respectively, are tunnel coupled so to implement a DC SQUID. is the quantum phase difference over junction having normal-state resistance , is the applied magnetic flux threading the SQUID loop, and is the total heat current flowing through the structure.

Image of FIG. 2.
FIG. 2.

(a) Interference heat current vs calculated for a few values of r. Here we set generic temperatures and such that . (b) Total heat current vs calculated for a few values of at assuming r = 1.

Image of FIG. 3.
FIG. 3.

(a) Average total heat current over one flux quantum vs calculated for some values of . (b) Total heat current modulation amplitude vs calculated for the same values as in panel (a).

Image of FIG. 4.
FIG. 4.

(a) Scheme of a practical setup consisting of a temperature-biased DC SQUID threaded by a magnetic flux . Superconducting probes tunnel-coupled to both SQUID branches serve either as heaters (H) or thermometers (Th). (b) Sketch of the thermal model accounting for heat transport in the system. represents the coupling between quasiparticles in and the lattice phonons residing at , whereas denotes the power injected into through heating probes in order to impose a quasiparticle temperature . The arrows indicate the direction of heat currents for .

Image of FIG. 5.
FIG. 5.

(a) Quasiparticle temperature vs calculated for a few values of at . (b) Flux-to-temperature transfer function vs calculated for selected values of at . (c) calculated for different at . (d) calculated for the same values as in panel (c).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Phase-controlled superconducting heat-flux quantum modulator