Andreev Molecule in Parallel InAs Nanowires
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- acs.nanolett.1c01956
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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.
Originalsprog | Engelsk |
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Tidsskrift | Nano Letters |
Vol/bind | 21 |
Udgave nummer | 19 |
Sider (fra-til) | 7929-7937 |
Antal sider | 9 |
ISSN | 1530-6984 |
DOI | |
Status | Udgivet - 13 okt. 2021 |
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