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arXiv 2103.14083cond-mat.mes-hall
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平行InAs纳米线中的Andreev分子

Andreev molecule in parallel InAs nanowires

Olivér Kürtössy, Zoltán Scherübl, Gergő Fülöp, István Endre Lukács, Thomas Kanne, Jesper Nygård, Péter Makk, Szabolcs Csonka

摘要:

通过隧穿耦合单个原子从根本上改变了物质的状态:束缚在原子核上的电子变得离域,导致从绝缘状态变为金属状态,正如从固体的典型例子中所熟知的那样。如果隧穿通过超导真空发生,原子链可能会导致更奇异的状态,并可以诱导拓扑保护的激发,如马约拉纳或副费米子。为了实现这种人工链,将单个原子耦合到超导真空中已经得到了很好的研究,但是通过超导体实现两个位置的杂化还没有报道。BCS凝聚体的特殊真空为湮灭或从体中产生两个电子开辟了道路,从而导致所谓的Andreev分子态。通过采用平行纳米线与铝超导壳,两个人工原子之间的外延超导链接创建在一个最小的距离。通过BCS真空的杂化首次在两个人造原子之间观察到,作为Andreev分子状态的证明。

英文摘要:

Coupling individual atoms via tunneling fundamentally changes the state of matter: electrons bound to atomic cores become delocalized resulting in a change from an insulating to a metallic state, as it is well known from the canonical example of solids. 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. Toward the realization of such artificial chains, coupling a single atom to the superconducting vacuum is well studied, but the hybridization of two sites via the superconductor was not yet reported. The peculiar vacuum of the 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 superconductor shell, two artificial atoms were created at a minimal distance with an epitaxial superconducting link between. Hybridization via the BCS vacuum was observed between the two artificial atoms for the first time, as a demonstration of an Andreev molecular state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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