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arXiv 1503.02297cond-mat.mes-hallcond-mat.supr-con
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正常-超导量子点中的交叉热电耦合

Cross thermoelectric coupling in normal-superconductor quantum dots

Sun-Yong Hwang, Rosa Lopez, David Sanchez

摘要:

讨论了在外加电压和温度差作用下,耦合到正常和超导储层的相互作用量子点的非线性电流。由于超导引线引入的粒子-空穴对称性,纯(子隙)热电响应消失。然而,我们发现,Andreev束缚态转移的热梯度的增加。因此,如果系统同时被电压偏置,则可以用温度偏置来调谐$I$- $V$特性。这是一种交叉效应,仅发生在线性响应之外。此外,我们强调的准粒子隧穿过程中产生的高热电势灵敏度的作用。

英文摘要:

We discuss the nonlinear current of an interacting quantum dot coupled to normal and superconducting reservoirs with applied voltage and temperature differences. Due to the particle-hole symmetry introduced by the superconducting lead, the pure (subgap) thermoelectric response vanishes. However, we show that the Andreev bound states shift as the thermal gradient increases. As a consequence, the $I$--$V$ characteristic can be tuned with a temperature bias if the system is simultaneously voltage biased. This is a cross effect that occurs beyond linear response only. Furthermore, we emphasize the role of quasiparticle tunneling processes in the generation of high thermopower sensitivities.

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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