Tan Z B, Laitinen A, Kirsanov N S, Galda A, Vinokur V M, Haque M, Savin A, Golubev D S, Lesovik G B, Hakonen P J
Low Temperature Laboratory, Department of Applied Physics, Aalto University, Espoo, Finland.
Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Nat Commun. 2021 Jan 8;12(1):138. doi: 10.1038/s41467-020-20476-7.
Generation of electric voltage in a conductor by applying a temperature gradient is a fundamental phenomenon called the Seebeck effect. This effect and its inverse is widely exploited in diverse applications ranging from thermoelectric power generators to temperature sensing. Recently, a possibility of thermoelectricity arising from the interplay of the non-local Cooper pair splitting and the elastic co-tunneling in the hybrid normal metal-superconductor-normal metal structures was predicted. Here, we report the observation of the non-local Seebeck effect in a graphene-based Cooper pair splitting device comprising two quantum dots connected to an aluminum superconductor and present a theoretical description of this phenomenon. The observed non-local Seebeck effect offers an efficient tool for producing entangled electrons.
通过施加温度梯度在导体中产生电压是一种被称为塞贝克效应的基本现象。这种效应及其逆效应在从热电发电机到温度传感等各种应用中得到了广泛应用。最近，有人预测在混合正常金属 - 超导体 - 正常金属结构中，非局部库珀对分裂与弹性共隧穿的相互作用可能产生热电效应。在此，我们报告了在一个基于石墨烯的库珀对分裂器件中观察到的非局部塞贝克效应，该器件包括两个连接到铝超导体的量子点，并给出了这一现象的理论描述。观察到的非局部塞贝克效应为产生纠缠电子提供了一种有效的工具。
