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Abstract: While heating of a current carrying Ohmic conductors is an obviousconsequence of the diffusive nature of the conduction in such systems, currentinduced cooling has been recently reported in some molecular conductionjunctions. In this paper we demonstrate by simple models the possibility ofcooling molecular junctions under applied bias, and discuss several mechanismsfor such an effect. Our model is characterized by single electron tunnelingbetween electrodes represented by free electron reservoirs through a systemcharacterized by it electron levels, nuclear vibrations and their structures.We consider cooling mechasims resulting from a cooling of one electrodesurface by tunneling induced depletion of high energy electrons; b cooling bycoherent sub resonance electronic transport analogous to atomic laser nducedcooling and c the incoherent analog of process b - cooling by drivenactivated transport. The non-equilibrium Green function formulation of junctiontransport is used in the first two cases, while a master equation approach isapplied in the analysis of the third.



Autor: Michael Galperin, Keiji Saito, Alexander V. Balatsky, Abraham Nitzan

Fuente: https://arxiv.org/







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