论文标题
约瑟夫森连接的非线性热电学中的噪声效应
Noise effects in the nonlinear thermoelectricity of a Josephson junction
论文作者
论文摘要
我们研究了两个具有不同零温度间隙的超导体之间的热偏置隧道连接中的噪声电流。当抑制约瑟夫森效应时，由于我们最近在理论上预测的那样，由于电子孔对称性的自发断裂，该结构可以支持非线性热电效应。我们讨论了交界处的噪音可能相关的作用。虽然中等噪声的贡献有助于产生热电信号，但进一步揭示了电子孔对称性破坏的自发性质，但大噪声贡献可以引起两个固定的热电值之间的切换，从而硬化效果及其应用。我们证明，热电效应对于广泛参数的噪声具有鲁棒性，并且可以通过增加交界处的电容来降低热电信号的虚假波动，例如，通过扩大交界处的大小。我们的结果为超导连接中热电效应的未来实验观察铺平了道路，并改善了用于热管理设计的量子电路的性能。
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.
