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arXiv 2009.05565cond-mat.mes-hallcond-mat.supr-con
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约瑟夫森结非线性热电特性中的噪声效应

Noise effects in the nonlinear thermoelectricity of a Josephson junction

G. Marchegiani, A. Braggio, F. Giazotto

摘要:

本文研究了两个不同零温带隙的超导体之间的热偏置隧道结中的噪声电流。当约瑟夫森效应被抑制时,这种结构可以支持由于电子-空穴对称性的自发破缺而产生的非线性热电效应,正如我们最近在理论上预测的那样。我们讨论了可能相关的作用,在交界处的噪声。虽然适度的噪声贡献有助于产生热电信号,进一步揭示了电子-空穴对称性破缺的自发性质,但是大的噪声贡献可以引起两个稳态热电值之间的切换,从而强化了对效应及其应用的检测。我们表明,热电效应是强大的噪声的存在下,为广泛的参数和寄生波动的热电信号可以降低通过增加结的电容,例如通过扩大结的大小。我们的研究结果铺平了道路,未来的实验观察超导结中的热电效应,并提高性能的量子线路设计的热管理。

英文摘要:

We investigate the noise current in a thermally biased tunnel junction between two superconductors with different zero-temperature gaps. When the Josephson effect is suppressed, this structure can support a nonlinear thermoelectric effect due to the spontaneous breaking of electron-hole symmetry, as we recently theoretically predicted. We discuss the possibly relevant role played by the noise in the junction. While a moderate noise contribution assists the generation of the thermoelectric signal, further unveiling the spontaneous nature of the electron-hole symmetry breaking, a large noise contribution can induce a switching between the two stationary thermoelectric values, thus hardening the detection of the effect and its application. We demonstrate that the thermoelectric effect is robust to the presence of noise for a wide range of parameters and that the spurious fluctuations of the thermoelectric signal can be lowered by increasing the capacitance of the junction, for instance by expanding the junction's size. Our results pave the way to the future experimental observation of the thermoelectric effect in superconducting junctions, and to improved performance in quantum circuits designed for thermal management.

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