Measurements of the thermal properties of nanoscale electron systems have ignored the effect of electrical noise radiated between the electron gas and the environment, through the electrical leads. Here we calculate the effect of this photon-mediated process, and show that the low-temperature thermal conductance is equal to the quantum of thermal conductance, GQ=π2k2BT/3h, times a coupling coefficient. We find that, at very low temperatures, the photon conductance is the dominant route for thermal equilibration, while at moderate temperatures this relaxation mode adds one quantum of thermal conductance to that due to phonon transport.
Physical Review Letters
- Pub Date:
- July 2004
- Nonelectronic thermal conduction and heat-pulse propagation in solids;
- thermal waves;
- Thermal radiation;
- Thermal properties of small particles nanocrystals and nanotubes