  We introduce a new concept for electrically controlled heat flux modulation.
A flux contrast larger than 10 dB is expected with switching time on the order
of tens of nanoseconds. Heat flux modulation is based on the interplay between
radiative heat transfer at the nanoscale and phase change materials. Such large
contrasts are not obtainable in solids, or in far field. As such this opens up
new horizons for temperature modulation and actuation at the nanoscale.
