Local Heating and Cooling criterion in Nanoscale Systems
Ilias Amanatidis1*, Yu-Chang Chen1
1Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
* presenting author:Ilias Amanatidis, email:eliasamanatidis1@hotmail.com
We study at zero bias voltage limit the conditions under which local cooling and heating exist in the case of electron-phonon interactions. Our calculations are based on a simple model, coupled to a single phonon that provides us a microscopic and detailed picture of the heating mechanism generated in nanoscale systems. We show that the electron-phonon coupling constant introduces an interplay between two mechanisms that of local cooling and that of local heating. More specific, assuming the simplest form for the coupling constant, an energy linear dependence local heating occurs when its slope is positive that is that the rate of absorption energy by the ion atom is smaller than the rate of its emission while local cooling occurs when the slope of the electron-phonon coupling constant is negative, that is that the rate of the phonon absorption is larger than the rate of the phonon energy emission.

Keywords: nanosystems, local heating , local cooling, electron-phonons