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Nanopatterning of Weak Links in Superconducting Oxide Interfaces

Department of Microtechnology and Nanoscience—MC2, Chalmers University of Technology, SE 412 96 Gothenburg, Sweden
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
Author to whom correspondence should be addressed.
Academic Editors: Jose Maria De Teresa and Soraya Sangiao
Nanomaterials 2021, 11(2), 398;
Received: 30 December 2020 / Revised: 22 January 2021 / Accepted: 28 January 2021 / Published: 4 February 2021
(This article belongs to the Special Issue Nanopatterned Functional Materials)
The interface between two wide band-gap insulators, LaAlO3 and SrTiO3 (LAO/STO), hosts a quasi-two-dimensional electron gas (q2DEG), two-dimensional superconductivity, ferromagnetism, and giant Rashba spin-orbit coupling. The co-existence of two-dimensional superconductivity with gate-tunable spin-orbit coupling and multiband occupation is of particular interest for the realization of unconventional superconducting pairing. To investigate the symmetry of the superconducting order parameter, phase sensitive measurements of the Josephson effect are required. We describe an approach for the fabrication of artificial superconducting weak links at the LAO/STO interface using direct high-resolution electron beam lithography and low-energy argon ion beam irradiation. The method does not require lift-off steps or sacrificial layers. Therefore, resolution is only limited by the electron beam lithography and pattern transfer. We have realized superconducting weak links with a barrier thickness of 30–100 nm. The barrier transparency of the weak links can be controlled by the irradiation dose and further tuned by a gate voltage. Our results open up new possibilities for the realization of quantum devices in oxide interfaces. View Full-Text
Keywords: LaAlO3/SrTiO3 interface; two-dimensional superconductivity; top-down lithography; nanopatterned materials LaAlO3/SrTiO3 interface; two-dimensional superconductivity; top-down lithography; nanopatterned materials
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MDPI and ACS Style

Singh, G.; Lesne, E.; Winkler, D.; Claeson, T.; Bauch, T.; Lombardi, F.; Caviglia, A.D.; Kalaboukhov, A. Nanopatterning of Weak Links in Superconducting Oxide Interfaces. Nanomaterials 2021, 11, 398.

AMA Style

Singh G, Lesne E, Winkler D, Claeson T, Bauch T, Lombardi F, Caviglia AD, Kalaboukhov A. Nanopatterning of Weak Links in Superconducting Oxide Interfaces. Nanomaterials. 2021; 11(2):398.

Chicago/Turabian Style

Singh, Gyanendra, Edouard Lesne, Dag Winkler, Tord Claeson, Thilo Bauch, Floriana Lombardi, Andrea D. Caviglia, and Alexei Kalaboukhov. 2021. "Nanopatterning of Weak Links in Superconducting Oxide Interfaces" Nanomaterials 11, no. 2: 398.

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