Trocha Piotr, Siuda Emil
Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University, Poznań, 61-614, Poland.
Sci Rep. 2022 Mar 30;12(1):5348. doi: 10.1038/s41598-022-09105-z.
We investigate spin thermoelectric properties of a hybrid system consisting of a single-level quantum dot attached to magnetic insulator and metal electrodes. Magnetic insulator is assumed to be of ferromagnetic type and is a source of magnons, whereas metallic lead is reservoir of electrons. The temperature gradient set between the magnetic insulator and metallic electrodes induces the spin current flowing through the system. The generated spin current of magnonic (electric) type is converted to electric (magnonic) spin current by means of quantum dot. Expanding spin and heat currents flowing through the system, up to linear order, we introduce basic spin thermoelectric coefficients including spin conductance, spin Seebeck and spin Peltier coefficients and heat conductance. We analyse the spin thermoelectric properties of the system in two cases: in the large ondot Coulomb repulsion limit and when these interactions are finite.
我们研究了一个由附着在磁性绝缘体和金属电极上的单能级量子点组成的混合系统的自旋热电性质。假设磁性绝缘体为铁磁类型，是磁振子的来源，而金属引线是电子的库。在磁性绝缘体和金属电极之间设置的温度梯度会诱导自旋电流流过该系统。通过量子点，产生的磁振子（电）型自旋电流被转换为电（磁振子）型自旋电流。我们将流过系统的自旋电流和热电流展开到线性阶，引入了包括自旋电导、自旋塞贝克系数、自旋佩尔捷系数和热导率在内的基本自旋热电系数。我们分析了该系统在两种情况下的自旋热电性质：在大的量子点库仑排斥极限情况下以及当这些相互作用有限时。
