Heat conduction in molecular transport junctions

Details Heat conduction in molecular transport junctions Heat conduction in molecular transport junctions

2006-11-07

arxiv.org/abs/cond-mat/0611169v1

Phys. Rev. B 75, 155312 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

31 pages, 12 figures

Scientific paper

10.1103/PhysRevB.75.155312

Heating and heat conduction in molecular junctions are considered within a general NEGF formalism. We obtain a unified description of heating in current carrying molecular junctions as well as the electron and phonon contributions to the thermal flux, including their mutual influence. Ways to calculate these contributions, their relative importance and ambiguities in their definitions are discussed. A general expression for the phonon thermal flux is derived and used in a new "measuring technique", to define and quantify 'local temperature' in nonequilibrium systems. Superiority of this measuring technique over the usual approach that defines effective temperature using the equilibrium phonon distribution is demonstrated. Simple bridge models are used to illustrate the general approach, with numerical examples.

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