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首页> 外文期刊>Physical review >Large enhancement of thermoelectric effects in a double quantum dot system due to interference and Coulomb correlation phenomena
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Large enhancement of thermoelectric effects in a double quantum dot system due to interference and Coulomb correlation phenomena

机译：由于干扰和库仑相关现象，双量子点系统中的热电效应大大增强

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摘要

Thermoelectric effects in a double quantum dot system coupled to external magneticonmagnetic leads are investigated theoretically. The basic thermoelectric transport characteristics, like thermopower, electronic contribution to heat conductance, and the corresponding figure of merit, have been calculated in terms of the linear response theory and Green function formalism in the Hartree-Fock approximation for Coulomb interactions. An enhancement of the thermal efficiency (figure of merit ZT) due to Coulomb blockade has been found. The magnitude of ZT is further considerably enhanced by quantum interference effects. Both the Coulomb correlations and interference effects lead to strong violation of the Wiedemann-Franz law. The influence of spin-dependent transport and spin bias on the thermoelectric effects (especially on Seebeck and spin Seebeck effects) is also analyzed.
机译：理论上研究了与外部磁性/非磁性导线耦合的双量子点系统中的热电效应。已根据线性响应理论和库仑相互作用的Hartree-Fock近似中的格林函数形式主义，计算了基本的热电输运特性，例如热功率，电子对热导的贡献以及相应的品质因数。已经发现由于库仑封锁而提高了热效率（优点ZT值）。量子干涉效应进一步显着提高了ZT的幅度。库仑相关性和干扰效应都导致强烈违反Wiedemann-Franz定律。还分析了自旋依赖性输运和自旋偏压对热电效应的影响（特别是对塞贝克效应和自旋塞贝克效应的影响）。

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