Fizika Nizkikh Temperatur: Volume 44, Number 12 (December 2018), p. 1582-1587 ( to contents , go back )
Cooling of mechanical vibrations by heat flow
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
Department of Physics, Chalmers University of Technology, Kemigården 1, SE-412 96 Göteborg, Sweden
Received July 27, 2018, published online October 26, 2018
We theoretically consider a nanomechanical link between two metallic leads subject to a temperature drop. It is shown that mechanical dynamics of such system can be strongly affected by a heat flow through it via the position dependent electron-electron interaction, even though the electronic transport between leads is blocked. In particular, it is demonstrated that, under certain conditions, the stationary distribution of the excitations in the mechanical subsystem has a Boltzmann form with an effective temperature, which is much lower than the temperature of the environment; this seems rather counterintuitive. We also find that a change in the direction of the temperature gradient can result in the generation of mechanical vibrations rather than the heating of the mechanical subsystem.
Key words: nanoelectromechanical system, heat flow, Wigner distribution function.