  We describe measurements of 100 nK temperature oscillations at room
temperature, driven at the complex interface between p-doped Germanium, a nm
size metal layer, and an electrolyte. We show that heat is deposited at this
interface by thermoelectric effects, however the precise microscopic mechanism
remains to be established. The temperature measurement is accomplished by
observing the modulation of black body radiation from the interface. We argue
that this geometry offers a method to study molecular scale dissipation
phenomena. The Debye layer on the electrolyte side of the interface controls
much of the dynamics. Interpreting the measurements from first principles, we
show that in this geometry the Debye layer behaves like a low frequency
transmission line.
