I. Altfeder et al., Phys. Rev. Lett. 105 166101 (2010)
Cooling by proxy. A sharp metal point capped with a CO molecule cools rapidly when close to a gold surface. Vibrations in the CO (gray) translate into vibrations of its image charge (white), which generate heat-carrying phonons in the gold surface (blue). The experiment demonstrates what the authors call “phonon tunneling”–a transfer of vibrational energy across a vacuum gap.