Andreev Molecule in Parallel InAs Nanowires,Nano Letters

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Andreev Molecule in Parallel InAs Nanowires
Nano Letters ( IF 9.6 ) Pub Date : 2021-09-20 , DOI: 10.1021/acs.nanolett.1c01956
Olivér Kürtössy ₁ , Zoltán Scherübl _{1,

2} , Gergö Fülöp ₁ , István Endre Lukács ₃ , Thomas Kanne ₄ , Jesper Nygård ₄ , Péter Makk ₁ , Szabolcs Csonka ₁

Affiliation

Coupling individual atoms fundamentally changes the state of matter: electrons bound to atomic cores become delocalized turning an insulating state to a metallic one. A chain of atoms could lead to more exotic states if the tunneling takes place via the superconducting vacuum and can induce topologically protected excitations like Majorana or parafermions. Although coupling a single atom to a superconductor is well studied, the hybridization of two sites with individual tunability was not reported yet. The peculiar vacuum of the Bardeen–Cooper–Schrieffer (BCS) condensate opens the way to annihilate or generate two electrons from the bulk resulting in a so-called Andreev molecular state. By employing parallel nanowires with an Al shell, two artificial atoms were created at a minimal distance with an epitaxial superconducting link between. Hybridization via the BCS vacuum was observed and the spectrum of an Andreev molecule as a function of level positions was explored for the first time.

中文翻译：

平行 InAs 纳米线中的 Andreev 分子

耦合单个原子从根本上改变了物质的状态：与原子核结合的电子变得离域，将绝缘状态转变为金属状态。如果通过超导真空发生隧穿，并且可以诱发拓扑保护的激发，如马约拉纳或准费米子，则原子链可能会导致更奇特的状态。尽管对单个原子与超导体的耦合进行了深入研究，但尚未报道具有单独可调性的两个位点的杂交。Bardeen-Cooper-Schrieffer (BCS) 凝聚的特殊真空为从体中湮灭或产生两个电子开辟了道路，从而形成所谓的 Andreev 分子态。通过使用具有铝壳的平行纳米线，在最小距离处创建了两个人造原子，它们之间有外延超导连接。

更新日期：2021-10-13

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