Heat Current in Three-terminal Double Quantum Dot System with Spin-exchange Coupling
By using the quantum master equation method,the variation of heat and electron current with electric bias is studied in a three-teiminal spin-exchange coupled double quantum dot sys-tem.In the ferromagnetic case of electron exchange coupling,the currents through the quantum dot with two electrodes are blocked when the bias voltage is low,because the electron Fermi energy of electrodes is lower than the energy difference between the transition many body states of quantum dots.At high bias voltage,all transport channels are completely open,and the electronic current reaches a platform,but the heat flow increases linearly with the increase of bias voltage.In contrast,there is no blocking phenomenon in the antiferromagnetic case,because the energy level difference of transition channel that dominates the transport is smaller,it is easier to generate current and the bias required to reach the platform is lower.These results can provide theoretical basis for designing heat current de-vices based on quantum dots.
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