Thermoelectric effects in nanoscale junctions.
Despite its intrinsic nonequilibrium origin, thermoelectricity in nanoscale systems is usually described within a static scattering approach which disregards the dynamical interaction with the thermal baths that maintain energy flow. Using the theory of open quantum systems, we show instead that unexpected properties, such as a resonant structure and large sign sensitivity, emerge if the nonequilibrium nature of this problem is considered. Our approach also allows us to define and study a local temperature, which shows hot spots and oscillations along the system according to the coupling of the latter to the electrodes. This demonstrates that Fourier's lawa paradigm of statistical mechanicsis generally violated in nanoscale junctions.
Dubi
Yonatan
Y
Department of Physics, University of California San Diego, La Jolla, California 92093-0319, USA. dubij@physics.ucsd.edu
Di Ventra
Massimiliano
M
D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011789:Quantum Theory; D013499:Surface Properties; D013696:Temperature; D013817:Thermography / Q000379:methods*
D046911:Macromolecular Substances