Fig. 3
Thermal measurements of nanowires as a function of temperature. a Thermal conductances of two nanowires (2 NWs) and one nanowire (1 NW) versus temperature. These have been measured in two different heating configurations; red symbols refer to the heating from right to left, and black symbols from left to right. The inset shows the top view of the nanowire illustrating the various dimensions of the nanowire and especially the full length l = 5 μm and the constriction size w = 2.7 μm. b The thermal conductance of one nanowire is compared to the theoretical fits. The black line corresponds to the boundary limited regime in T3 (Casimir regime), the dark blue line is the universal quantum value of thermal conductance and the light blue line represents the best adjustment obtained with a power law in temperature of 1.8
