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Data on Physics Reported by Researchers at National Center for Scientific Research (CNRS) (Most efficient quantum thermoelectric at finite power...

July 8, 2014



Data on Physics Reported by Researchers at National Center for Scientific Research (CNRS) (Most efficient quantum thermoelectric at finite power output)

By a News Reporter-Staff News Editor at Physics Week -- Fresh data on Physics are presented in a new report. According to news reporting originating from Grenoble, France, by VerticalNews editors, the research stated, "Machines are only Carnot efficient if they are reversible, but then their power output is vanishingly small. Here we ask, what is the maximum efficiency of an irreversible device with finite power output? We use a nonlinear scattering theory to answer this question for thermoelectric quantum systems, heat engines or refrigerators consisting of nanostructures or molecules that exhibit a Peltier effect."

Our news editors obtained a quote from the research from National Center for Scientific Research (CNRS), "We find that quantum mechanics places an upper bound on both power output and on the efficiency at any finite power. The upper bound on efficiency equals Carnot efficiency at zero power output but decays with increasing power output. It is intrinsically quantum (wavelength dependent), unlike Carnot efficiency. This maximum efficiency occurs when the system lets through all particles in a certain energy window, but none at other energies."

According to the news editors, the research concluded: "A physical implementation of this is discussed, as is the suppression of efficiency by a phonon heat flow."

For more information on this research see: Most efficient quantum thermoelectric at finite power output. Physical Review Letters, 2014;112(13):130601. (American Physical Society - www.aps.org/; Physical Review Letters - prl.aps.org)

The news editors report that additional information may be obtained by contacting R.S. Whitney, Laboratoire de Physique et Modelisation des Milieux Condenses (UMR 5493), Universite Grenoble 1 and CNRS, Maison des Magisteres, BP 166, 38042 Grenoble, France.

Keywords for this news article include: France, Europe, Physics, Grenoble.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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