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Parallel InAs nanowires for Cooper pair splitters with Coulomb repulsion
npj Quantum Materials ( IF 5.7 ) Pub Date : 2022-09-09 , DOI: 10.1038/s41535-022-00497-9
Olivér Kürtössy, Zoltán Scherübl, Gergő Fülöp, István Endre Lukács, Thomas Kanne, Jesper Nygård, Péter Makk, Szabolcs Csonka

Hybrid nanostructures consisting of two parallel InAs nanowires connected by an epitaxially grown superconductor (SC) shell recently became available. Due to the defect-free SC-semiconductor interface and the two quasi-one-dimensional channels being close by, these platforms can be utilized to spatially separate entangled pairs of electrons by using quantum dots (QD) in the so-called Cooper pair splitting (CPS) process. The minimized distance between the QDs overcomes the limitations of single-wire-based geometries and can boost the splitting efficiency. Here we investigate CPS in such a device where strong inter-dot Coulomb repulsion is also present and studied thoroughly. We analyze theoretically the slight reduction of the CPS efficiency imposed by the Coulomb interaction and compare it to the experiments. Despite the competition between crossed Andreev reflection (CAR) and inter-wire capacitance, a significant CPS signal is observed indicating the dominance of the superconducting coupling. Our results demonstrate that the application of parallel InAs nanowires with epitaxial SC is a promising route for the realization of parafermionic states relying on enhanced CAR between the wires.



中文翻译:

用于库仑排斥的 Cooper 对分离器的平行 InAs 纳米线

由外延生长的超导体 (SC) 壳连接的两条平行 InAs 纳米线组成的混合纳米结构最近变得可用。由于无缺陷的 SC 半导体界面和靠近的两个准一维通道,这些平台可用于通过在所谓的库珀对分裂中使用量子点 (QD) 来空间分离纠缠的电子对(CPS) 过程。量子点之间的最小距离克服了基于单线的几何形状的限制,并且可以提高分裂效率。在这里,我们在这种设备中研究 CPS,其中也存在强的点间库仑排斥并进行了深入研究。我们从理论上分析了库仑相互作用对 CPS 效率的轻微降低,并将其与实验进行了比较。尽管交叉安德烈夫反射 (CAR) 和线间电容之间存在竞争,但观察到显着的 CPS 信号表明超导耦合占主导地位。我们的研究结果表明,平行 InAs 纳米线与外延 SC 的应用是实现依赖于线之间增强的 CAR 的准费米子态的有希望的途径。

更新日期:2022-09-09
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