Andreev Molecule in Parallel InAs Nanowires.

Andreev Molecule in Parallel InAs Nanowires.
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DOI:
10.1021/acs.nanolett.1c01956
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发表时间:
2021-10-13
期刊:
影响因子:
10.8
通讯作者:
Csonka S
Csonka S
中科院分区:
材料科学1区
文献类型:
--
作者:
Kürtössy O;Scherübl Z;Fülöp G;Lukács IE;Kanne T;Nygård J;Makk P;Csonka S

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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,从绝缘状态变成金属状态。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。虽然单原子与超导体的耦合已经被研究得很好,但具有单独可调谐性的两个位置的杂化还没有报道。Bardeen-Cooper-Schrieffer(BCS)凝聚体的特殊真空为湮灭或产生两个电子开辟了道路,导致所谓的Andreev分子态。通过采用具有铝壳的平行纳米线,在最小距离处产生两个人造原子,其间具有外延超导链接。通过BCS真空杂交观察到的Andreev分子的光谱作为一个功能的水平位置进行了首次探索。
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.
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发表时间: 2009-10-15
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