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Atomic structure and oxygen deficiency of the ultrathin aluminium oxide barrier in Al/AlOx/Al Josephson junctions

Lunjie Zeng (Institutionen för fysik, Eva Olsson Group (Chalmers)) ; D. T. Tran ; C. W. Tai ; G. Svensson ; Eva Olsson (Institutionen för fysik, Eva Olsson Group (Chalmers))
Scientific Reports (2045-2322). Vol. 6 (2016),
[Artikel, refereegranskad vetenskaplig]

Al/AlOx/Al Josephson junctions are the building blocks of a wide range of superconducting quantum devices that are key elements for quantum computers, extremely sensitive magnetometers and radiation detectors. The properties of the junctions and the superconducting quantum devices are determined by the atomic structure of the tunnel barrier. The nanoscale dimension and disordered nature of the barrier oxide have been challenges for the direct experimental investigation of the atomic structure of the tunnel barrier. Here we show that the miniaturized dimension of the barrier and the interfacial interaction between crystalline Al and amorphous AlOx give rise to oxygen deficiency at the metal/oxide interfaces. In the interior of the barrier, the oxide resembles the atomic structure of bulk aluminium oxide. Atomic defects such as oxygen vacancies at the interfaces can be the origin of the two-level systems and contribute to decoherence and noise in superconducting quantum circuits.

Nyckelord: superconducting qubits, amorphous materials, 2-level systems, al2o3, coordination, nanovolumes, decoherence, scattering, elnes, Science & Technology - Other Topics


Article Number: 29679



Denna post skapades 2016-08-18. Senast ändrad 2016-08-26.
CPL Pubid: 240395

 

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Institutioner (Chalmers)

Institutionen för fysik, Eva Olsson Group (Chalmers)

Ämnesområden

Fysik

Chalmers infrastruktur