Safdari Sayedreza, Soltani Morteza, Rashedi Gholamreza
Department of Physics, University of Isfahan, Isfahan 81746-73441, Iran.
Nanotechnology. 2023 Aug 31;34(46). doi: 10.1088/1361-6528/acefda.
We have studied a 5-terminal system consisting of three single level quantum dots (QDs) that are in contact with their respective reservoirs. In addition to the intra-dot Coulomb interaction, the electron in the dot affected by an inter-dot Coulomb repulsion from its adjacent QD. We describe this system by an Anderson type model Hamiltonian and apply the Greens function method to study the transport properties of the system. Since we are interested in temperatures higher than the Kondo temperature, we use the equations of motion technique to calculate Green's functions. Numerical analysis shows that there is a correlation between the transport characteristics of the lower and upper dot and we can change the conductivity of the lower dot only by varying the parameters of the upper dot and vice versa. We demonstrated that the middle dot play the role of the switch on/off of this correlation. Also, we investigated the effect of thermoelectric properties. We found that the inter-dot Coulomb interaction can improve the thermoelectric performance of the system.
我们研究了一个由三个单能级量子点（QD）组成的五端系统，这些量子点与其各自的库仑相互作用。除了点内库仑相互作用外，量子点中的电子还受到相邻量子点的点间库仑排斥作用。我们用安德森型模型哈密顿量来描述这个系统，并应用格林函数方法来研究系统的输运性质。由于我们感兴趣的温度高于近藤温度，我们使用运动方程技术来计算格林函数。数值分析表明，上下量子点的输运特性之间存在相关性，我们可以仅通过改变上量子点的参数来改变下量子点的电导率，反之亦然。我们证明了中间量子点起到了这种相关性的开关作用。此外，我们还研究了热电性质的影响。我们发现点间库仑相互作用可以提高系统的热电性能。
