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首页> 外文期刊>Physica, B. Condensed Matter >Thermoelectric properties of correlated double quantum dot system in Coulomb blockade regime
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Thermoelectric properties of correlated double quantum dot system in Coulomb blockade regime

机译：库仑封锁状态下相关双量子点系统的热电性质

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摘要

We theoretically study thermoelectric properties of a coupled double quantum dot (DQD) system coupled to normal leads using two impurity Anderson model with intra- as well as interdot Coulomb interactions. A generic formulation, which was earlier developed to study electronic properties (zero bias maximum of differential conductance and interesting partial swapping in Fano phenomena) of DQD system within Coulomb blockade regime for a non-magnetic case, is extended to investigate thermoelectric properties i.e. electrical conductance, thermoelectric power and thermal conductance of the same system, as a function of temperature by varying interdot Coulomb interaction and interdot tunneling. Interdot Coulomb interaction is found to trigger some novel features like crossover in thermoelectric power with temperature in all the configurations (series, parallel and T-shape) and a small peak in thermal conductance toward low temperatures, T≈Γ/10, in series and T-shape configurations, which is found to be missing in case of symmetric parallel configuration. The origin of these novel features is attributed to the interplay of renormalization of energy levels caused by the interdot Coulomb interaction which is interpreted in terms of local density of states and the asymmetry effects related to dot-lead couplings/interference effects.
机译：我们从理论上研究了使用双杂质点安德森模型以及点内和点间库仑相互作用的耦合双量子点（DQD）系统与正常引线的热电特性。对于非磁性情况，较早时已开发出一种通用公式，用于研究DQD系统在库仑阻塞状态下的电子特性（微分电导的零偏置最大值和有趣的Fano现象中的部分交换），从而扩展了其研究热电特性的范围，即电导率。通过改变点间库仑相互作用和点间隧穿，将同一系统的热电功率和热导率作为温度的函数。发现Interdot Coulomb相互作用会触发一些新颖的特征，例如在所有配置（串联，并联和T形）中热电功率随温度的交叉以及串联和并联时朝向低温的热导率小峰值T≈Γ/ 10。 T形配置，在对称平行配置的情况下会丢失。这些新颖特征的起源归因于由点间库仑相互作用引起的能级重整化的相互作用，这是根据状态的局部密度和与点-引线耦合/干涉效应有关的不对称效应来解释的。

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