High-efficiency thermal switch based on topological Josephson junctions
Sothmann, B. and Giazotto, F. and Hankiewicz, E.M.
NEW JOURNAL OF PHYSICS
Volume: 19 Pages:
We propose theoretically a thermal switch operating by the magnetic-flux controlled diffraction of phase-coherent heat currents in a thermally biased Josephson junction based on a two-dimensional topological insulator. For short junctions, the system shows a sharp switching behavior while for long junctions the switching is smooth. Physically, the switching arises from the Doppler shift of the superconducting condensate due to screening currents induced by a magnetic flux. We suggest a possible experimental realization that exhibits a relative temperature change of 40% between the on and off state for realistic parameters. This is a factor of two larger than in recently realized thermal modulators based on conventional superconducting tunnel junctions. © 2017 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.