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arXiv 2005.11869cond-mat.mes-hall
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有限二维类能带量子点阵列的热电性质

Thermoelectric properties of finite two-dimensional quantum dot arrays with band-like electronic states

David M T Kuo

摘要:

热功率($PF=S^2G_e$)取决于塞贝克系数($S$)和电子电导率($G_e$)。$G_e$的增强必然会抑制$S$,因为它们密切相关。因此,$PF$的优化是极其困难的。本文从理论上研究了载流子从电极注入的二维量子点阵列的热电性质。在共振隧穿过程中,二维量子点阵列的洛伦兹数满足Wiedemann-Franz定律,这证实了迷你带的形成。当能带中心远离电极费米能级时,电子输运属于电子辅助隧穿过程(TATP)。在此区域中,类能带情况下的$G_e$和类原子情况下的$S$可以同时发生。我们已经证明,随着电子态数量的增加,$G_e$的增强不会抑制TATP中的$S$。

英文摘要:

The thermal power ($PF=S^2G_e$) depends on the Seebeck coefficient ($S$) and electron conductance ($G_e$). The enhancement of $G_e$ will unavoidably suppress $S$ because they are closely related. As a consequence, the optimization of $PF$ is extremely difficult. Here, we theoretically investigated the thermoelectric properties of two-dimensional quantum dot (QD) arrays with carriers injected from electrodes. The Lorenz number of 2D QD arrays in the resonant tunneling procedure satisfies the Wiedemann-Franz law, which confirms the formation of minibands. When the miniband center is far away from the Fermi level of the electrodes, the electron transport is in the thermionic-assisted tunneling procedure (TATP). In this regime, $G_e$ in band-like situation and $S$ in atom-like situation can happen simultaneously. We have demonstrated that the enhancement of $G_e$ with an increasing number of electronic states will not suppress $S$ in the TATP.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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