Bipolar thermoelectric Josephson engine

Thermoelectric effects in metals are typically small due to the nearly perfect particle-hole symmetry around their Fermi surface. Furthermore, thermo-phase effects and linear thermoelectricity in superconducting systems have been identified only when particle-hole symmetry is explicitly broken, since thermoelectric effects were considered impossible in pristine superconductors. Here, we experimentally demonstrate that superconducting tunnel junctions develop a very large bipolar thermoelectricity in the presence of a sizable thermal gradient thanks to spontaneous particle-hole symmetry breaking. Our junctions show Seebeck coefficients of up to +/- 300 mu V K-1, which is comparable with quantum dots and roughly 10(5) times larger than the value expected for normal metals at subkelvin temperatures. Moreover, by integrating our junctions into a Josephson interferometer, we realize a bipolar thermoelectric Josephson engine generating phase-tunable electric powers of up to similar to 140 nW mm(-2). Notably, our device implements also the prototype for a persistent thermoelectric memory cell, written or erased by current injection. We expect that our findings will lead to applications in superconducting quantum technologies.

Automated summary

This study demonstrates the presence of large thermoelectric effects in superconducting tunnel junctions when there is a significant thermal gradient. By integrating these junctions into a Josephson interferometer, a bipolar thermoelectric Josephson engine capable of generating phase-tunable electric power is realized. These findings are expected to have applications in superconducting quantum technologies.