Charge and heat transport in nano-structures is dominated by non-equilibrium effects which strongly influence their behaviour. These effects are studied in a setup consisting of three external leads, one of which is considered as a heat reservoir and is tunnel-coupled to two cold electrodes via two independently controlled quantum dots. The energy flow from the hot electrode together with energy filtering provided by quantum dots leads to a voltage bias between the cold electrodes. The heat and charge currents in the device effectively flow in mutually perpendicular directions, allowing for their independent control. The non-equilibrium screening changes the values of the system parameters needed for its optimal performance but leaves the maximal output power and efficiency unchanged. Our results are important from the theoretical point of view as well as for the practical implementation and the control of the proposed heat engine.
Abstract. The thermoelectric transport in the device composed of a central nanoscopic system in contact with two electrodes and subject to the external magnetic field of Zeeman type has been studied. The device can support pure spin current in the electrodes and may serve as a source of the temperature induced spin currents with possible applications in spintronics. The system may also be used as an energy harvester. We calculate its thermodynamic efficiency η and the power output P . The maximal efficiency of the device reaches the Carnot value when the device works reversibly but with the vanishing power. The interactions between carriers diminish the maximal efficiency of the device, which under the constant load drops well below the Carnot limit but may exceed the Curzon-Ahlborn limit. While the effect of intradot Coulomb repulsion on η depends on the parameters, the interdot/interlevel interaction strongly diminishes the device efficiency.
he hrge nd spin thermoeletri trnsport in the system omposed of entrl moleule in ontt with two norml eletrodes in n externl mgneti (eld of the eemn type hve een studiedF uh system n support pure spin urrent for pplitions in spintronisF fy pproprite gte tuning of eh of the dots it is possile to eletrilly ontrol the diretion of the spin urrent or tune the devie operting s thermoeletri genertor to optiml performneFst hs een shown tht the devie is poor energy onverter in the prmeter region where its thermoeletri (gure of merit ttins very lrge vluesF hysX IHFIPTWQGehysoleFIPTFIISW egX UQFPQF!D UQFTQFuvD UQFPQFrk
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