Reprint of : Three-terminal heat engine and refrigerator based on superlattices

Thermal conductance of Nb thin films at sub-kelvin temperatures

“…Development of new technologies requires sustainable energy supplies 1 . To this purpose, the field of thermoelectrics focuses on new materials and devices, such as heat engines 2 3 4 and refrigerators 5 6 for energy harvesting in low-dimensional systems 1 7 . When it comes to mesoscopic devices fabricated at the nanoscale level, control of heat transport is essential 8 and challenging at the same time 9 .…”